博士（工学）, 北海道大学

薄膜

表面科学

バイオセンサー

カーボンナノチューブ

グラフェン

スピントロニクス

ものづくり技術（機械・電気電子・化学工学）, 電子デバイス、電子機器

ナノテク・材料, 薄膜、表面界面物性

ナノテク・材料, ナノ材料科学

学士課程, 工学部

修士課程, 情報科学院

博士課程, 情報科学院

Influence of bias voltage on the performance of polarization-sensitive near-infrared photodiode based on dilute nitride GaNAs
Daiki Mineyama; Tatsuya Yano; Kohei Etou; Kaito Nakama; Hidetoshi Hashimoto; Keisuke Minehisa; Junichi Takayama; Agus Subagyo; Kazuhisa Sueoka; Fumitaro Ishikawa; Akihiro Murayama; Satoshi Hiura
Applied Physics Letters, 126, 22, AIP Publishing, 2025年06月02日
研究論文（学術雑誌）, Recent advances in ultrafast light polarization modulation and electrical control of polarization have increased the demand for polarization-sensitive photodetectors to enable polarization-based optical communication systems. The conduction electron population of dilute nitride GaNAs changes with excitation light polarization owing to the spin-dependent recombination of conduction electrons via the dynamic polarization of defect electron spins. However, polarization-sensitive photodetectors that utilize this property are limited to photoconductive devices with a long response time. In this study, we developed a polarization-sensitive near-infrared photodiode based on GaNAs. The influence of light power and bias voltage on the discrimination efficiency between circularly and linearly polarized light was investigated using coupled rate equation analysis for polarization-dependent photocurrent characteristics. At −2.0 V, where the discrimination efficiency reached 1%, the extraction time of the conduction electrons to the electrode was estimated to be 34 ps. This result suggests that the developed polarization-sensitive photodiode can operate at 10 GHz. The discrimination efficiency increased with light power because of the activated spin-selective capture of conduction electrons by spin-polarized defect states for circularly polarized light, whereas it decreased with increasing reverse bias voltage. This low performance originates from suppressed spin-selective capture, which is due to the combination of electric-field-induced spin relaxation and a decrease in the capture efficiency of conduction electrons. This study provides valuable insights into the influence of the bias voltage on the polarization-dependent photocurrent, which is a key challenge to the realization of practical polarization-sensitive photodiodes based on the spin-dependent recombination effect of conduction electrons.

Efficient Room-Temperature Operation of a Quantum Dot Spin-Polarized Light-Emitting Diode under High-Bias Conditions
Kohei Etou; Satoshi Hiura; Soyoung Park; Junichi Takayama; Agus Subagyo; Kazuhisa Sueoka; Akihiro Murayama
Physical Review Applied, 19, 2, American Physical Society (APS), 2023年02月21日
研究論文（学術雑誌）

Room-Temperature Spin-Transport Properties in an In0.5Ga0.5As Quantum Dot Spin-Polarized Light-Emitting Diode
Kohei Etou; Satoshi Hiura; Soyoung Park; Kazuya Sakamoto; Junichi Takayama; Agus Subagyo; Kazuhisa Sueoka; Akihiro Murayama
Physical Review Applied, 16, 1, American Physical Society (APS), 2021年07月14日, ［査読有り］
研究論文（学術雑誌）

Relationship between rheological properties and actin filaments of single cells investigated by atomic force microscopy
Ryosuke Tanaka; Maki Sawano; Yuki Fujii; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
Japanese Journal of Applied Physics, 59, SN, SN1010, SN1010, IOP Publishing, 2020年08月01日, ［査読有り］
研究論文（学術雑誌）

Electron-transfer-induced metallic electronic states in a H/Fe3O4(001) film subsurface
Satoshi Hiura; Agus Subagyo; Akihiro Murayama; Kazuhisa Sueoka
Applied Physics Express, 12, 5, 055502, 055502, {IOP} Publishing, 2019年04月05日, ［査読有り］
研究論文（学術雑誌）

Visualising the dynamics of live pancreatic microtumours self-organised through cell-in-cell invasion
Yukiko Miyatake; Kaori Kuribayashi-Shigetomi; Yusuke Ohta; Shunji Ikeshita; Agus Subagyo; Kazuhisa Sueoka; Akira Kakugo; Maho Amano; Toshiyuki Takahashi; Takaharu Okajima; Masanori Kasahara
Scientific Reports, 8, 1, 2018年12月19日, ［査読有り］
英語, 研究論文（学術雑誌）

Origami-based self-folding of co-cultured NIH/3T3 and HepG2 cells into 3D microstructures
Qian He; Takaharu Okajima; Hiroaki Onoe; Agus Subagyo; Kazuhisa Sueoka; Kaori Kuribayashi-Shigetomi
Scientific Reports, 8, 1, Springer Science and Business Media {LLC}, 2018年03月, ［査読有り］
研究論文（学術雑誌）

Temporal Variation in Single-Cell Power-Law Rheology Spans the Ensemble Variation of Cell Population
PingGen Cai; Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; John M. Maloney; Krystyn J. Van Vliet; Takaharu Okajima
Biophysical Journal, 113, 3, 671, 678, 2017年08月08日, ［査読有り］
研究論文（学術雑誌）

酵素処理がLDLの物性に与える影響(Effect of enzymes treatment on physical properties of lowdensity lipoprotein)
Takeda Seiji; Subagyo Agus; Hui Shu-Ping; Fuda Hirotoshi; Sueoka Kazuhisa; Chiba Hitoshi
生物物理, 57, Suppl.1-2, S278, S278, (一社)日本生物物理学会, 2017年08月
英語

Direct observation of subsurface charge ordering in Fe
Hiura Satoshi; Ikeuchi Akira; Jochi Masafumi; Yamazaki Riku; Takahashi Sotaro; Subagyo Agus; Murayama Akihiro; Sueoka Kazuhisa
Appl. Phys. Express, 10, 4, 045701, 045701, Institute of Physics, 2017年04月01日, ［査読有り］
英語, 研究論文（学術雑誌）, In this study, we characterized Fe3O4(001) films using scanning tunneling microscopy/spectroscopy (STM/STS). On the film surfaces, individual iron atoms and ([Formula: see text])R45° reconstructed structures were observed by STM. The STS results showed that the local density of states just below the Fermi level was higher in narrow sections than in wide sections of the surface reconstruction perpendicular to the iron rows. Periodic density of states modulations reproducing this electronic structure were clearly observed in the differential tunneling conductance map. These experimental results revealed the presence of subsurface charge ordering of Fe²⁺–Fe²⁺and Fe³⁺–Fe³⁺dimers, as proposed in previous density functional theory studies.

酸化と酵素切断がLDLの物性に与える影響(Physical properties of low-density lipoprotein after oxidation or proteolytic enzyme treatment)
Takeda Seiji; Subagyo Agus; Hui Shu-Ping; Fuda Hirotoshi; Sueoka Kazuhisa; Chiba Hitoshi
生物物理, 56, Suppl.1-2, S290, S290, (一社)日本生物物理学会, 2016年10月
英語

Mapping cell-to-cell variations in power-law rheology investigated by multifrequency force modulation atomic force microscopy
M. Sawano; R. Tanaka; R. Takahashi; K. Kurubayashi-Shigetomi; A. Subagyo; K. Sueoka; T. Okajima
MOLECULAR BIOLOGY OF THE CELL, 27, 2016年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Elastic modulus of low-density lipoprotein as potential indicator of its oxidation
Seiji Takeda; Agus Subagyo; Shu-Ping Hui; Hirotoshi Fuda; Rojeet Shrestha; Kazuhisa Sueoka; Hitoshi Chiba
ANNALS OF CLINICAL BIOCHEMISTRY, 52, 6, 647, 653, 2015年11月, ［査読有り］
英語, 研究論文（学術雑誌）

Correlation between OH density and Fe electronic states of H/Fe3O4(001) film surfaces studied by scanning tunneling microscopy/spectroscopy
Satoshi Hiura; Akira Ikeuchi; Soraya Shirini; Agus Subagyo; Kazuhisa Sueoka
JAPANESE JOURNAL OF APPLIED PHYSICS, 54, 8, 08LB02, 2015年08月, ［査読有り］
英語, 研究論文（学術雑誌）

Effect of adsorbed H atoms on the Fe electronic states of Fe3O4(001) film surfaces
Satoshi Hiura; Akira Ikeuchi; Soraya Shirini; Agus Subagyo; Kazuhisa Sueoka
PHYSICAL REVIEW B, 91, 20, 205411, 2015年05月, ［査読有り］
英語, 研究論文（学術雑誌）

Size dependence of electron spin dephasing in InGaAs quantum dots
Y. Q. Huang; Y. Puttisong; I. A. Buyanova; X. J. Yang; A. Subagyo; K. Sueoka; A. Murayama; W. M. Chen
APPLIED PHYSICS LETTERS, 106, 9, 93109, 2015年03月, ［査読有り］
英語, 研究論文（学術雑誌）

High-throughput measurements of single cell rheology by atomic force microscopy
Kaori Kuribayashi-Shigetomi; Ryosuke Takahashi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
Hyper Bio Assembler for 3D Cellular Systems, 57, 67, Springer Japan, 2015年01月01日, ［査読有り］
英語, 論文集(書籍)内論文

Growth-temperature dependence of optical spin-injection dynamics in self-assembled InGaAs quantum dots
Takafumi Yamamura; Takayuki Kiba; Xiaojie Yang; Junichi Takayama; Agus Subagyo; Kazuhisa Sueoka; Akihiro Murayama
JOURNAL OF APPLIED PHYSICS, 116, 9, 94309, 2014年09月, ［査読有り］
英語, 研究論文（学術雑誌）

Anomalous spectral dependence of optical polarization and its impact on spin detection in InGaAs/GaAs quantum dots
Y. Puttisong; Y. Q. Huang; I. A. Buyanova; X. J. Yang; A. Subagyo; K. Sueoka; A. Murayama; W. M. Chen
APPLIED PHYSICS LETTERS, 105, 13, 132106, 2014年09月, ［査読有り］
英語, 研究論文（学術雑誌）

AFMによる酸化LDL粒子の物理的性質の解析(Mechanical properties of oxidized low-density lipoprotein particles disclosed with AFM)
Takeda Seiji; Subagyo Agus; Hui Shu-Ping; Fuda Hirotoshi; Sueoka Kazuhisa; Chiba Hitoshi
生物物理, 54, Suppl.1-2, S149, S149, (一社)日本生物物理学会, 2014年08月
英語

Atomic force microscopy measurements of mechanical properties of single cells patterned by microcontact printing
Ryosuke Takahashi; Satoshi Ichikawa; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
ADVANCED ROBOTICS, 28, 7, 449, 455, 2014年04月, ［査読有り］
英語, 研究論文（学術雑誌）

3P169 多重周波数モジュレーション原子間力顕微鏡法:単一細胞レオロジーの高速測定(細胞生物的課題,ポスター,第52回日本生物物理学会年会(2014年度))
Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
生物物理, 54, 1, S277, 一般社団法人 日本生物物理学会, 2014年
英語

3P189 マイクロパターン上に培養した単一細胞の細胞核の動態(細胞生物的課題,ポスター,第52回日本生物物理学会年会(2014年度))
Xinfeng Zhu; Kaori Kuribayashi-Shigetomi; Pinggen Cai; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
生物物理, 54, 1, S280, 一般社団法人 日本生物物理学会, 2014年
英語

1P053 AFMによる酸化LDL粒子の物理的性質の解析(01C. 蛋白質 : 物性,ポスター,第52回日本生物物理学会年会(2014年度))
Takeda Seiji; Subagyo Agus; Hui Shu-Ping; Fuda Hirotoshi; Sueoka Kazuhisa; Chiba Hitoshi
生物物理, 54, 1, S149, 一般社団法人 日本生物物理学会, 2014年
英語

Temporal Change in Complex Shear Modulus of Cells: An Atomic Force Microscopy Study
PingGen Cai; Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 1, 3, 2014年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Atomic Force Microscopy for Mapping Mechanical Property of the Whole Cell Assembly
Ryosuke Tanaka; Yuki Fujii; Junpei Kikkawa; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 1, 2, 2014年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Quantitative Rheological Measurements of Confluent Cell Using Atomic Force Microscopy
Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 1, 3, 2014年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Scanning Tunneling Microscopy Study of an Altered Fe₃O₄(001) Thin Films Surface by Hydrogen Adsorption
Satoshi Hiura; Akira Ikeuchi; Soraya Shirini; Agus Subagyo; Kazuhisa Sueoka
e-Journal of Surface Science and Nanotechnology, 12, 26, 30, Surface Science Society Japan, 2014年, ［査読有り］
英語, 研究論文（学術雑誌）

Ultrafast spin tunneling and injection in coupled nanostructures of InGaAs quantum dots and quantum well
Xiao-Jie Yang; Takayuki Kiba; Takafumi Yamamura; Junichi Takayama; Agus Subagyo; Kazuhisa Sueoka; Akihiro Murayama
APPLIED PHYSICS LETTERS, 104, 1, 12406, 2014年01月, ［査読有り］
英語, 研究論文（学術雑誌）

Temperature dependence of the dynamics of optical spin injection in self-assembled InGaAs quantum dots
KIBA Takayuki; YANG Xiao-jie; YAMAMURA Takafumi; KUNO Yuki; SUBAGYO Agus; SUEOKA Kazuhisa; MURAYAMA Akihiro
Appl Phys Lett, 103, 8, 082405-082405-5, 082405, AIP Publishing, 2013年08月19日, ［査読有り］
英語, 研究論文（学術雑誌）

High-throughput measurements of cell mechanics using atomic force microscopy with micro-patterned substrates.
Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Masahiro Tsuchiya; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
International Symposium on Micro-NanoMechatronics and Human Science, MHS 2013, Nagoya, Japan, November 10-13, 2013, 1, 3, 2013年, ［査読有り］
研究論文（国際会議プロシーディングス）

高比誘電率膜を形成したCNT-FET pHセンサの作製
豊島 侑史; アグス スバギョ; 中村 基訓; 末岡 和久
応用物理学会学術講演会講演予稿集, 2012.2, 3597, 3597, 公益社団法人 応用物理学会, 2012年08月27日
日本語

Noncontact Atomic Force Microscopy Observation of Fe₃O₄(001) Surface (Special Issue : Scanning Probe Microscopy)
Mizuno Taichi; Hosoi Hirotaka; Subagyo Agus; Oishi Suguru; Ikeuchi Akira; Hiura Satoshi; Sueoka Kazuhisa
Jpn J Appl Phys, 51, 8, 08KB03, 08KB03-4, The Japan Society of Applied Physics, 2012年08月25日, ［査読有り］
英語, Fe3O4 is one of the important oxide materials and its surface structure should be well understood to enable application of this material. We report the first noncontact atomic force microscopy (NC-AFM) results for Fe3O4(001) thin films. The observed films were grown homoepitaxially on magnetite thin films substrate. A low-energy electron diffraction pattern shows the well-known (\sqrt{2}\times \sqrt{2})R45° reconstructed structure. The observed minimum step height is 0.21 nm, corresponding to the distance between the same planes. We obtain two types of atomic-scale NC-AFM images. One image shows bright protrusions along the [100] and [010] directions at intervals of 0.84 nm corresponding to a unit cell of the (\sqrt{2}\times \sqrt{2})R45° reconstructed structure. The other image shows a more detailed atomic structure with 0.6 and 0.3 nm corrugations.

Atomically Resolved Observations of Antiphase Domain Boundaries in Epitaxial Fe₃O₄ Films on MgO(001) by Scanning Tunneling Microscopy (Special Issue : Scanning Probe Microscopy)
Ikeuchi Akira; Hiura Satoshi; Mizuno Taichi; Kaji Eisaku; Subagyo Agus; Sueoka Kazuhisa
Jpn J Appl Phys, 51, 8, 08KB02, 08KB02-5, The Japan Society of Applied Physics, 2012年08月25日, ［査読有り］
英語, We have studied the surface atomic configurations around antiphase domain boundaries (APBs) in epitaxial magnetite (Fe3O4) thin films on MgO(001) by scanning tunneling microscopy (STM). The observed surface of the Fe3O4 films is the B-plane terminating surface with the (\sqrt{2}\times\sqrt{2})R45^{\circ} reconstruction. Several variations of APBs are observed by STM at atomic resolution. The observed APBs are categorized into a APBs labeled by three different phase shift vectors: in-plane 1/4[110], in-plane 1/2[100], and out-of-plane 1/4[101]. We discussed how these APBs appear on the surface. The proportions of the APBs with 1/4[110], 1/2[100], and 1/4[101] shifts are about 38, 1, and 61%, respectively, in our experiment.

Direct observation of dynamic force propagation between focal adhesions of cells on microposts by atomic force microscopy
A. Okada; Y. Mizutani; A. Subagyo; H. Hosoi; M. Nakamura; K. Sueoka; K. Kawahara; T. Okajima
Appl. Phys. Lett., 99, 26, 263703-1, 263703-3, 2011年12月26日, ［査読有り］
英語, 研究論文（学術雑誌）

Calculation method of reflectance distributions for computer-generated holograms using the finite-difference time-domain method
Tsubasa Ichikawa; Yuji Sakamoto; Agus Subagyo; Kazuhisa Sueoka
APPLIED OPTICS, 50, 34, H211, H219, 2011年12月, ［査読有り］
英語, 研究論文（学術雑誌）

LOCAL ELECTRONIC PROPERTIES OF DOMAIN BOUNDARIES ON c(2 × 2) Fe(001) THIN FILM SURFACES
HIROFUMI OKA; AGUS SUBAGYO; KAZUHISA SUEOKA
International Journal of Nanoscience, 05, 06, 935, 942, World Scientific Pub Co Pte Lt, 2011年11月
研究論文（学術雑誌）

In Situ STM Observation of the Spiral Growth in the Epitaxial Fe Films on MgO(001)
Agus Subagyo; Kazuhisa Sueoka; Koichi Mukasa
MRS Proceedings, 580, Cambridge University Press ({CUP}), 2011年02月
研究論文（学術雑誌）

A method of Calculating Reflectance Distributions for CGH with FDTD using the Structure of Actual Surfaces
Ichikawa Tsubasa; Sakamoto Yuji; Subagyo Agus; Sueoka Kazuhisa
PRACTICAL HOLOGRAPHY XXV: MATERIALS AND APPLICATIONS, 7957, 2011年, ［査読有り］

エンドコンタクト型CNTFETにおける電気特性評価
中村 基訓; スバギョ アグス; 末岡 和久
応用物理学会学術講演会講演予稿集, 2010.2, 3598, 3598, 公益社団法人 応用物理学会, 2010年08月30日
日本語

マイクロピラー基板上に培養した生細胞のAFMナノ力学測定
岡田 晃典; 中村 基訓; アグス スバギョ; 細井 浩貴; 末岡 和久; 水谷 裕輔; 河原 剛一; 岡嶋 孝治
応用物理学会学術講演会講演予稿集, 2010.1, 2673, 2673, 公益社団法人 応用物理学会, 2010年03月03日
日本語

Holders for in situ treatments of scanning tunneling microscopy tips
Nobuyuki Ishida; Agus Subagyo; Akira Ikeuchi; Kazuhisa Sueoka
Review of Scientific Instruments, 80, 9, 093703, 093703, 2009年09月, ［査読有り］
研究論文（学術雑誌）

Surface magnetic structure of epitaxial magnetite thin films grown on MgO(001)
Eisaku Kaji; Agus Subagyo; Masashi Arita; Kazuhisa Sueoka
Journal of Applied Physics, 105, 7, 2009年04月01日, ［査読有り］
研究論文（学術雑誌）

Needle-type field-effect transistor based on carbon nanotube derivative without lithography process
Seiji Takeda; Motonori Nakamura; Agus Subagyo; Atsushi Ishii; Kazuhisa Sueoka; Koichi Mukasa
Sensors and Actuators B: Chemical, 132, 1, 9, 12, 2008年05月28日, ［査読有り］
研究論文（学術雑誌）

Inhomogeneous surface electronic properties and charge ordering in epitaxial Fe3O4 films on MgO(001)
A. Subagyo; Y. Sasaki; H. Oka; K. Sueoka
physica status solidi (b), 244, 12, 4482, 4485, 2007年12月, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）

A pH sensor based on electric properties of nanotubes on a glass substrate.
Takeda S; Nakamura M; Ishii A; Subagyo A; Hosoi H; Sueoka K; Mukasa K
Nanoscale research letters, 2, 4, 207, 212, 2007年03月, ［査読有り］
英語

Large area magnetic domain imaging of magnetite films with Spin-SEM
Eisaku Kaji; Agus Subagyo; Kazuhisa Sueoka
Physica Status Solidi (C) Current Topics in Solid State Physics, 4, 12, 4364, 4367, 2007年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Large area magnetic domain imaging of magnetite films with Spin-SEM
Eisaku Kaji; Agus Subagyo; Kazuhisa Sueoka
physica status solidi (c), 4, 12, 4364, 4367, 2007年, ［査読有り］
研究論文（学術雑誌）

Correlation between Surface Structure and Charge Ordering in Magnetite(001) Studied by Scanning Tunneling Microscopy and Spectroscopy
Subagyo Agus; Sueoka Kazuhisa
PROCEEDINGS OF THE INTERNATIONAL CONFERENCE ON NANOSCIENCE AND TECHNOLOGY, 61, 1102, 1106, 2007年, ［査読有り］
研究論文（国際会議プロシーディングス）

Spin-Polarized Scanning Tunneling Microscopy Study on Charge Ordering of Reconstructed Fe3O4(001) Film Surfaces
Subagyo Agus; Sueoka Kazuhisa
Jpn J Appl Phys, 45, 3B, 2255, 2258, Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics, 2006年03月27日, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, Fe3O4(001) film surfaces having a ($\sqrt{2} \times \sqrt{2}$)$R$45° reconstruction are studied by scanning tunneling microscopy (STM) and spin-polarized STM (SP-STM). The reconstruction is induced by ordered arrays of oxygen vacancy at B-terminated surfaces as revealed by STM. Fe cation rows having a wavelike structure oriented along the [110] direction with a separation of 0.6 nm are observed. A single Fe cation with a 0.3 nm periodicity within the cation rows is resolved. Instead of a single Fe cation, SP-STM imaged an alternation of high and low corrugations representing Fe3+–Fe3+ dimers and Fe2+–Fe2+ dimers, respectively. The resolving of Fe dimers having different spin states by SP-STM is due to the contribution of spin-polarized tunneling current. The Fe3+–Fe3+ and Fe2+–Fe2+ dimers have a separation of about 0.6 nm in the [110] direction, while in the [$1\bar{1}0$] direction these dimers alternate by about 0.65 and 0.55 nm. The separation is consistent with the wavelike row structure on the ($\sqrt{2}\times \sqrt{2}$)$R$45° reconstructed Fe3O4(001) film surfaces.

Directional diffusion of K atoms on a gaas(110) surface
Ishida Nobuyuki; Subagyo Agus; Sueoka Kazuhisa
INTERNATIONAL JOURNAL OF NANOSCIENCE, VOL 5, NO 6, 5, 6, 895, +, 2006年, ［査読有り］
英語, 研究論文（国際会議プロシーディングス）

Local electronic properties of domain boundaries on c(2 x 2) Fe(001) thin film surfaces
Oka Hirofumi; Subagyo Agus; Sueoka Kazuhisa
INTERNATIONAL JOURNAL OF NANOSCIENCE, VOL 5, NO 6, 5, 6, 935, +, 2006年, ［査読有り］

Defect-Induced Charge Freezing on Epitaxial Fe3O4(001) Film Surfaces Studied by Spin-Polarized Scanning Tunneling Microscopy
Subagyo Agus; Sueoka Kazuhisa
Japanese journal of applied physics. Pt. 1, Regular papers & short notes, 44, 7B, 5447, 5450, Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics, 2005年07月26日, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, We report the role of atom defects on the charge freezing of Fe3O4(001) surfaces studied by spin-polarized scanning tunneling microscopy (SP-STM) using a Ni tip. Epitaxially grown Fe3O4(001) films on a MgO(001) substrate were used as samples. Atomically flat surfaces are obtained by annealing in an ultrahigh vacuum and in oxygen. The surfaces exhibit a $(\sqrt{2}\times\sqrt{2})R45$° reconstruction as revealed by STM with a W tip. STM images indicate surface termination at B-sites. An atomic structure with a 0.3 nm periodicity is observed within the cation rows that are aligned along the [110] direction. SP-STM images show a pronouncedly different periodicity of 1.2 nm on areas having surface defects such as cation vacancies. This corrugation with a 1.2 nm periodicity can be attributed to a charge localization of Fe3+ and Fe2+ ions that are trapped by cation vacancies and then isolated from the electron hopping process. The results also indicate the important role of oxygen vacancies in modifying the 1.2 nm periodicity.

In situ Conductance Measurement of a Limited Number of Nanoparticles during Transmission Electron Microscopy Observation
HIROSE Ryusuke; ARITA Masashi; HAMADA Kouichi; TAKAHASHI Yasuo; SUBAGYO Agus
Jpn J Appl Phys Part 2, 44, 24-27, L790-L792, L792, Japan Society of Applied Physics, 2005年07月10日, ［査読有り］
英語, A technique for measuring the conductance of a small number of particles during transmission electron microcopy (TEM) observation is demonstrated. By using a custom-designed TEM holder, an Au tip was brought into contact with Fe nanodots contained in a SrF2 film deposited on another Au tip. The conductance shows Coulomb-blockade-like characteristics even at room temperature.

Reconstruction and charge ordering of epitaxial Fe3O4(001) films
Agus Subagyo; Kazuhisa Sueoka; Koichi Mukasa
Journal of Magnetism and Magnetic Materials, 290-291, 1037, 1039, Elsevier {BV}, 2005年04月, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）

Anti-phase domains and charge ordering on epitaxial magnetite films studied by spin-polarized scanning tunneling microscopy
Agus Subagyo; Kazuhisa Sueoka
INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference, 350, IEEE Computer Society, 2005年
英語, 研究論文（国際会議プロシーディングス）

Magnetic imaging with scanning probe microscopy
K Sueoka; A Subagyo; H Hosoi; K Mukasa
NANOTECHNOLOGY, 15, 10, S691, S698, 2004年10月, ［査読有り］
英語, 研究論文（学術雑誌）

Self-Assembled Low-Dimensional Potassium Structures on GaAs(110)
Ishida Nobuyuki; Subagyo Agus; Hosoi Hirotaka; Sueoka Kazuhisa; Mukasa Koichi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes, 43, 7, 4557, 4560, Published by the Japan Society of Applied Physics through the Institute of Pure and Applied Physics, 2004年07月15日, ［査読有り］
英語, We investigated the adsorption structures of K atoms on a GaAs(110) surface as a function of coverage by scanning tunneling microscopy. We found three kinds of adsorption structures, namely, the low-density linear chain, the asymmetric chain and the symmetric chain. At the initial stage with low coverage, K atoms form low-density linear and asymmetric chains. With increasing coverage, low-density linear chains disappeared and the number of asymmetric chains increased. At high adsorption coverage, K atoms began to form symmetric chains, so that the symmetric and asymmetric chains coexisted. The strong dependency of the adsorption structure on the coverage is discussed by considering a recent theoretical work.

Atomic Scale Observation of Domain Boundaries on $c(2\times 2)$ Fe(001) Thin Film Surfaces
Oka Hirofumi; Subagyo Agus; Sawamura Makoto; Sueoka Kazuhisa; Mukasa Koichi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes, 41, Part 1, No. 7B, 4969, 4972, 社団法人応用物理学会, 2002年07月30日, ［査読有り］
英語, 研究論文（学術雑誌）, Scanning tunneling microscopy (STM) measurements reveal that Fe thin films epitaxially grown on a MgO(001) substrate under appropriate conditions have an atomic step-terrace surface with a $c(2\times 2)$ surface reconstruction, and that this surface is often accompanied by line-like patterns along the Fe$\langle 110 \rangle$ direction. We have investigated the electronic properties of the patterns in detail by atomically resolved STM. We found that the pattern is a domain phase boundary of the $c(2\times 2)$ domains, and that the domain boundaries consist of atoms exhibiting a ($1\times 1$) structure. The STM image shows remarkable bias-voltage dependency as indicated by the contrast inversion between the patterns and $c(2\times 2)$ domains as the polarity of the applied bias-voltage is changed, and the contrast achieved its maximum value at $+0.2$ V. This bias-voltage dependency of the patterns can be explained by the existence of surface states which are observed at around 0.2 eV above the Fermi level on the Fe(001) ($1\times 1$) surface and 0.4 eV on the $c(2\times 2)$ domains.

Spin Electronic States and Geometry of Fe Nanowire : Comparison with Au, Pt, Cu, Na, Mg, Al, Si, and Xe Atomic Strands
SAWAMURA Makoto; HOSOI Hirotaka; KIMURA Michiya; EILERS Guido; SUBAGYO Agus; SUEOKA Kazuhisa; MUKASA Koichi
Transactions of the Magnetics Society of Japan, 2, 2, 63, 68, 公益社団法人日本磁気学会, 2002年05月01日
英語, The geometries and spin electronic states of single atomic strands consisting of Fe atoms were studied in comparison with similar strands of Au, Pt, Cu, Na, Mg, Al, Si, and Xe atoms, using first principles molecular orbital methods. Finite cluster models comprising six atoms were constructed. The optimized geometry of the wire was obtained for each element as the wire was elongated. Abnormally long atomic distances were observed in the cases of Fe, Au, Pt, Cu, Na, Mg, and Xe wires, which have shallow and broad s-orbitals in their valence shells. On the other hand, the wires formed from Al and of Siatoms collapsed while growing to lengths in excess of the bulk atomic distances. These atoms have σ-bonds with their neighboring atoms in the wires. Their electronic states create steep and deep potential energy wells, which prohibit long atomic distances.

Growth and characterization of Fe(100)/InAs(100) hybrid structures
H Ohno; K Yoh; T Doi; A Subagyo; K Sueoka; K Mukasa
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY B, 19, 6, 2280, 2283, 2001年11月, ［査読有り］
英語, 研究論文（学術雑誌）

Scanning Tunneling Spectroscopy of $c(2{\times}2)$ Reconstructed Fe Thin-Film Surfaces
Oka Hirofumi; Subagyo Agus; Sawamura Makoto; Sueoka Kazuhisa; Mukasa Kōichi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes, 40, 6, 4334, 4336, Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyo, 2001年06月30日
英語, Fe thin films with flat surfaces are obtained on a MgO(001) substrate at a growth temperature of 550 K. The surfaces with atomically flat and wide terraces exhibit a $c(2{\times}2)$ reconstructed structure. To evaluate the effect of impurity atoms at the surface on the surface structures, scanning tunneling spectroscopy (STS), reflection high energy electron diffraction (RHEED) and X-ray photoelectron spectroscopy (XPS) studies were performed. The differential conductivity (${dI/dV}$) spectrum of the $c(2{\times}2)$ Fe(001) thin-film surfaces indicates an intense peak at the sample bias voltage of 0.4 V. Since there is no clear evidence of impurity adatoms forming such a surface structure, we expect that the topmost atoms are Fe, and that the observed peak originates from surface states.

Scanning Tunneling Microscopy Observation of Epitaxial bcc-Fe(001) Surface
Subagyo Agus; Oka Hirofumi; Eilers Guido; Sueoka Kazuhisa; Mukasa Koichi
Japanese journal of applied physics. Pt. 1, Regular papers & short notes, 39, Part 1, No. 6B, 3777, 3779, 社団法人応用物理学会, 2000年06月30日, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, We report the first atomic-resolution scanning tunneling microscopy (STM) image of epitaxial bcc-Fe(001) films grown on MgO(001) substrates. A 50-Å-thick Fe film grown at a growth temperature of 550 K formed square pyramidal islands with atomically flat terraces. The terraces were found to range between 5 nm and 20 nm in width separated by monoatomic high steps. The film exhibited a ($1\times 1$) unreconstructed structure at a film thickness below 19 Å; however, a reconstructed surface was found on thicker films. The atomic-resolution STM image and low energy electron diffraction (LEED) observation indicated that the reconstructed structure is a c($2\times 2$) structure.

In situ STM observation of the spiral growth in the epitaxial Fe films on MgO(001)
A Subagyo; K Sueoka; K Mukasa
NUCLEATION AND GROWTH PROCESSES IN MATERIALS, 580, 429, 434, 2000年, ［査読有り］, ［筆頭著者］
英語, 研究論文（国際会議プロシーディングス）

Growth morphology of epitaxial Fe films on annealed MgO [001] surfaces
A. Subagyo; K. Sueoka; K. Mukasa
IEEE Transactions on Magnetics, 35, 5, 3037, 3039, 1999年09月, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）

Scanning Thnneling Microscopy Study of Surface Structure and Magnetism of Fe Thin Films Grown on MgO (001).
Subagyo Agus; Sueoka Kazuhisa; Mukasa Koichi; Hayakawa Kazunobu
Japanese Journal of Applied Physics, 38, Part 1, No. 6B, 3820, 3825, 公益社団法人 応用物理学会, 1999年06月30日, ［査読有り］, ［筆頭著者］
英語, 研究論文（学術雑誌）, Substrate preparation procedure dependence of the growth morphology and magnetic properties of 25 ML bcc-Fe(001) thin films epitaxially grown on MgO(001) substrates in a wide range of growth temperature was investigated by means of scanning tunneling microscopy (STM) and superconducting quantum interference device (SQUID). The growth morphology of Fe thin films was uniform both on a polished and on an annealed substrate, but nonuniform on a cleaved substrate. It was very difficult to obtain a flat Fe thin film on the cleaved substrate, and the film became discontinuous at or above a growth temperature of 493 K. At a growth temperature of 550 K, atomically defined terraces of Fe thin films were formed on the annealed substrate but were not formed on the polished substrate. A continuous film grown on the annealed substrate at a temperature of 593 K has a less magnetic anisotropy. The other continuous films have low coercivity of about 8 Oe and a biaxial magnetic anisotropy. The dependency of the growth morphology and magnetic properties of Fe thin films upon substrate preparation procedures concerning the presence of step-terraces on the substrate surface is discussed.

Spin-polarized tunneling between Fe thin films and an optically pumped GaAs probe
K. Sueoka; A. Subagyo; K. Mukasa
Digests of the Intermag Conference, IEEE, 1999年
英語, 研究論文（国際会議プロシーディングス）

Growth morphology of epitaxial Fe films on annealed MgO (001) surfaces
Agus Subagyo; Kazuhisa Sueoka; Koichi Mukasa
Digests of the Intermag Conference, IEEE, 1999年
英語, 研究論文（国際会議プロシーディングス）

STMによる光照射GaAs薄膜劈開探針の研究
末岡 和久; 細山 直樹; SUBAGYO Agus; 武笠 幸一; 早川 和延
表面科学, 19, 8, 522, 526, 日本表面科学会, 1998年08月10日, ［査読有り］
日本語

陽極酸化法によるシリ コン MIS 型太陽電池
Agus SUBAGYO; Yukinari HAYASHI; Susumu TOKUDA; Masaki YOSHINO; Junji NANJO
Denki Kagaku oyobi Kogyo Butsuri Kagaku, 66, 2, 206, 211, The Electrochemical Society of Japan, 1998年02月05日, ［査読有り］, ［筆頭著者］
研究論文（学術雑誌）

化学先取りシンポジウム 酸化還元電位および硬さ分布からLDLの酸化状態を評価
武田 晴治; アグス・スバギョ; 布田 博敏; 惠 淑萍; 末岡 和久; 千葉 仁志, 臨床化学, 46, Suppl.1, 175, 175, 2017年09月
(一社)日本臨床化学会, 日本語

LDLの酸化および酵素処理が硬さに与える影響について
武田 晴治; アグス・スバギョ; 布田 博敏; 惠 淑萍; 末岡 和久; 千葉 仁志, 臨床化学, 46, Suppl.1, 329, 329, 2017年09月
(一社)日本臨床化学会, 日本語

最先端表面分析手法 : 元素分析から電子状態解析まで (特集 進化する最先端計測・解析技術とナノテクノロジープラットフォームによる施設共用)
大塚 俊明; 松尾 保孝; 坂入 正敏; 鈴木 啓太; 上野 貢生; 孫 泉; 三澤 弘明; スバギョ アグス; 末岡 和久, 金属, 86, 12, 1103, 1111, 2016年12月
アグネ技術センター, 日本語

InGaAs量子ドットへの電流スピン注入による円偏光発光の温度依存性
明井祐人; 野村譲; 高山純一; 木場隆之; 山村隆文; 山崎大樹; SUBAGYO Agus; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 76th, 2015年

半導体自己組織化量子ドットへのトンネル効果によるスピン注入;励起スピン密度依存性
YANG Xiaojie; 山村隆文; 木場隆之; 高山純一; SUBAGYO Agus; 末岡和久; 村山明宏, 応用物理学会春季学術講演会講演予稿集(CD-ROM), 61st, 2014年

金属強磁性体電極を持つInGaAs量子構造発光ダイオードのEL特性
野村譲; 高山純一; 木場隆之; AGUS Subagyo; 山村隆文; YANG Xiaojie; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th, 2014年

InGaAs量子ドットと量子井戸の結合スピン状態に対する電界印加効果
高山純一; 木場隆之; 山村隆文; 野村譲; AGUS Subagyo; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th, 2014年

InGaAs量子井戸から量子ドットへのトンネル効果によるスピン注入ダイナミクス;トンネル障壁厚さ依存性
山村隆文; YANG Xiaojie; 木場隆之; 高山純一; SUBAGYO Agus; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 75th, 2014年

Fe電極を用いた量子ドット発光ダイオードのEL特性
佐々木裕也; YANG Xiaojie; 高山純一; 木場隆之; SUBAGYO Agus; 池内昭郎; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 74th, 2013年

InGaAs自己組織化量子ドットにおける光スピン注入ダイナミクスの成長温度依存性
山村隆文; YANG Xiaojie; 木場隆之; 高山純一; SUBAGYO Agus; 末岡和久; 村山明宏, 応用物理学会秋季学術講演会講演予稿集(CD-ROM), 74th, 2013年

マグネタイト薄膜表面における電荷秩序整列
スバギョ アグス; 末岡 和久, まぐね = Magnetics Japan, 3, 4, 174, 179, 2008年04月01日, ［筆頭著者］
日本磁気学会, 日本語

STM/STSによる表面磁気構造の局所観察
岡 博文; SUBAGYO Agus; 末岡 和久, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 28, 0, 149, 149, 2004年09月21日
日本語

Local Spin Electronic States of Carbon Nanotubes
澤村 誠; 細井 浩貴; スバギョ アグス; 末岡 和久; 武笠 幸一, 日本物理学会講演概要集, 56, 2, 775, 775, 2001年09月03日
社団法人日本物理学会, 英語

鉄ナノワイヤのスピン電子状態と構造 : 他の原子ナノワイヤとの比較
澤村 誠; 細井 浩貴; スバギョ アグス; 木村 道哉; アイレアス ギドー; 末岡 和久; 武笠 幸一, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 25, 0, 258, 258, 2001年09月01日
英語

STM環境におけるナノワイヤのスピン電子状態
澤村 誠; 細井 浩貴; 木村 道哉; アイレアス ギドー; スバギョ アグス; 末岡 和久; 武笠 幸一, 日本物理学会講演概要集, 56, 1, 810, 810, 2001年03月09日
社団法人日本物理学会, 英語

Growth and characterization of Fe(100)/InAs(100) hybrid structures
Hiroshi Ohno; Kanji Yoh; Toshihiro Doi; Agus Subagyo; Kazuhisa Sueoka; Koichi Mukasa, Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 19, 6, 2280, 2280, 2001年
American Vacuum Society

23pWA-5 Mg0(001)上のCu薄膜成長の温度と成長レート依存性
Eilers Guido; 松浦 雅晴; 岡 博文; Subagyo Agus; 末岡 和久; 武笠 幸一, 日本物理学会講演概要集, 55, 2, 765, 765, 2000年09月10日
一般社団法人日本物理学会, 日本語

GaAs探針によるFe薄膜の観察
末岡 和久; スバギョ アグス; 武笠 幸一; 早川 和延, 日本応用磁気学会学術講演概要集 = Digest of ... annual conference on magnetics in Japan, 22, 0, 12, a-12-b, 1998年09月01日
日本語

Mapping cell-to-cell variations in power-law rheology investigated by multifrequency force modulation atomic force microscopy
M. Sawano; R. Tanaka; R. Takahashi; K. Kurubayashi-Shigetomi; A. Subagyo; K. Sueoka; T. Okajima
MOLECULAR BIOLOGY OF THE CELL, 2016年, AMER SOC CELL BIOLOGY, 英語
2016年 - 2016年

Quantitative Rheological Measurements of Confluent Cell Using Atomic Force Microscopy
Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 2014年, IEEE, 英語
2014年 - 2014年, Rheological properties of cells are associated with various cell functions and thus are considered to be an indicator for diagnosing cell disease. Atomic force microscopy (AFM) is a powerful tool for quantifying the mechanical properties of isolated single cells. For example, our AFM technique reported previously revealed that the complex shear modulus of single cells exhibited a large cell-to-cell variation which depended on frequency. By contrast, rheological properties of cell population such as cells in confluent condition have been less understood. Thus, it is valuable to investigate how quantitatively the AFM technique can be applied to cell population such as cells in confluent condition. As a result, rheological properties of cells in confluent conditions can be relatively rapidly measured by our AFM setup modifying a force modulation AFM mode. This suggests that the AFM technique is useful for diagnosing not only single cells but also cell population and cell assembly.

Atomic Force Microscopy for Mapping Mechanical Property of the Whole Cell Assembly
Ryosuke Tanaka; Yuki Fujii; Junpei Kikkawa; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 2014年, IEEE, 英語
2014年 - 2014年, Cells rapidly undergo cell division during the embryogenesis. Such dynamic behaviors of cells during the embryogenesis are considered to be strongly associated with their mechanical properties such as cell-cell mechanical interactions and cell stiffness. However, the interplay between the morphogenesis and the mechanical property of whole cell assembly during the developmental process has not been well understood. To exploring the mechanism of forming the whole cell assembly, we proposed atomic force microscopy (AFM) combined with a microarray technique, which allows us to map mechanical property of the whole cell assembly. In this AFM setup, the cell assembly is randomly directed in the microarray well, and thus the average mechanical property of the whole cell assembly can be reconstructed from mapping images obtained from different cell assemblies.

Temporal Change in Complex Shear Modulus of Cells: An Atomic Force Microscopy Study
PingGen Cai; Ryosuke Takahashi; Kaori Kuribayashi-Shigetomi; Agus Subagyo; Kazuhisa Sueoka; Takaharu Okajima
2014 INTERNATIONAL SYMPOSIUM ON MICRO-NANOMECHATRONICS AND HUMAN SCIENCE (MHS), 2014年, IEEE, 英語
2014年 - 2014年, To sort living cells according to our needs, it is important to understand how degree cell property measured for cell sorting fluctuates in time. Mechanical property of cells is one of essential indicators for cell sorting. Thus, in this study, we attempted to measure a time evolution of viscoelastic property such as complex shear modulus, G* of single cells adhered on substrates using atomic force microscopy (AFM). We observed that the G* largely fluctuated in time even the cells are placed on substrates in a confined condition. This indicates that in mechanical cell sorting, mechanical fluctuations of cells should be carefully estimated so that cells are precisely separated by taking the measured data involving cell fluctuations into account.

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マグネタイト薄膜中の逆位相境界欠陥と表面不均一物性の相関
科学研究費助成事業
2021年04月01日 - 2024年03月31日
アグス スバギョ
初年度では，炭素吸着したマグネタイト表面のスピン偏極度向上の効果を調べるために，申請の段階で実施し始めた通電加熱法の炭素吸着の条件の最適化を図った．また，通電加熱法の炭素吸着の結果を踏まえ，電子ビーム加熱蒸着装置を用いた炭素吸着を検討して実施した．STMやLEED等による原子構造の評価，XPSを用いたマグネタイト組成や炭素吸着時の不純物の評価もおこなった．
マグネタイト試料は，MgO(001)基板にマグネタイト(001)薄膜をエピタキシャル成長させて作成した．マグネタイト薄膜表面は，清浄表面である再構成構造を示すことと，逆位相境界を有することを原子分解STMで確認した．このようなマグネタイト清浄表面上に，通電加熱したグラッシーカーボンフォイルを用いて炭素吸着をおこなった結果，マグネタイト薄膜表面の鉄原子列上に原子レベルの炭素吸着の他に，クラスター状に吸着した炭素もわずかに観察されていた．炭素吸着のない鉄原子上と原子状炭素吸着の局所電子状態を比較すると，吸着炭素上の局所電子状態では新たな状態がみられ，理論計算によって導かれた電子状態におけるスピン偏極したダウンスピンの電子状態と一致した．
均一な炭素吸着した表面を作製するために，炭素吸着チェンバーに通電加熱法の他に電子ビーム加熱蒸着装置を設置した．さらに，炭素吸着のレートを正確に把握するために膜厚モニターも設置した．電子ビーム加熱蒸着装置を用いることにより，通電加熱法より低いレートでの吸着が可能であり，クラスター状の炭素吸着が少なく，より均一な炭素原子吸着したマグネタイト薄膜表面が作製できた．
日本学術振興会, 基盤研究(C), 北海道大学, 21K04824

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