直流バイアス磁場下における各種軟磁性コアの鉄損挙動の特徴解析 【国内学会/口頭発表】 大沼智幸, 小野暢久, 岡本聡 日本金属学会2025年春期第176回講演大会, 東京, Mar. 8th-10th, 2025
High-Frequency Core Loss Reduction in Fe-Based Soft Magnetic Ribbons: A Microstructural Approach 【国際学会/招待講演】 R. Gautam, S. Hiramoto, H. Mamiya, T. Ogasawara, S. Okamoto, T. Ohkubo, H. Sepehri-Amin MMM Intermag 2025, New Orleans, US, Jan. 13th-17th, 2025
Novel approaches of nanocrystalline alloys with large saturation magnetization for next-generation power-electronics applications 【国際学会/招待講演】 S. Okamoto, A. Urata, H. Oikawa, S. Hiramoto, N. Ono, R. Gautam, H. Sepehri-Amin, T. Ohkubo, T. Ogasawara MMM Intermag 2025, New Orleans, US, Jan. 13th-17th, 2025
Soft Magnets 【国際学会/招待講演】 S. Okamoto MMM Intermag 2025, New Orleans, US, Jan. 13th-17th, 2025
2024
Observation of the magnon Hall effect of magnetostatic forward volume waves 【国際学会/招待講演】 谷口卓也 SpinX 2024, 仙台, Dec. 9th-10th, 2024
Towards fundamental understanding of iron loss in soft magnets 【国際学会/招待講演】 谷口卓也 Tohoku University & National Taipei University of Technology, 仙台, Nov. 26th-27th, 2024
Physical Origin of Excess Loss due to Magnetostriction in Soft Magnetic Materials 【国際学会/招待講演】 H. Tsukahara, H. Huang, K. Suzuki, K. Akira, K. Ono, S. Okamoto ENGE 2024, Jeju, KR, Nov. 24th-27th, 2024
Approaches of Ultra-low Loss Soft Magnetic Materials for Next-generation Power Electronics 【国際学会/招待講演】 S. Okamoto ENGE 2024, Jeju, KR, Nov. 24th-27th, 2024
Effect of nanostructure on the core loss of soft magnetic materials 【国内学会/招待講演】 H. Sepehri-Amin, R. Gautam, A. Bolyachkin, N. Kulesh, S. Hiramoto, H. Mamiya, S. Okamoto, T. Miyatake, T. Ohkubo 第48回日本磁気学会学術講演会, 秋田, Sep. 24th-27th, 2024
Iron loss behaviors of various inductors under dc bias fields 【国際学会/口頭発表】 T. Onuma, N. Ono, S. Okamoto MORIS 2024, York, UK, May. 28th-31st, 2024
Observation of the Magnon Hall Effect of Magnetostatic Forward Volume Spin Waves 【国際学会/ポスター発表】 T. Taniguchi, C. Riedel, F. Vilsmeier, S. Okamoto, C. H. Back MORIS 2024, York, UK, May. 28nd-31st, 2024
Clustering FORC diagram using the Gaussian mixture model and the Davies-Bouldin index 【国際学会/ポスター発表】 R. Ying, T. Taniguchi, K. Nabeta, K. Ishigami, N. Kikuchi, S. Okamoto MORIS 2024, York, UK, May. 28nd-31st, 2024
Effect of binder content on structure and magnetic properties of Fe-Si powder cores 【国際学会/ポスター発表】 M. P. NguyenYing, S. Yoshida, S. Okamoto, T. Miyazaki, Y. Endo INTERMAG2024, Rio de Janeiro, BR, May. 5th-31st, 2024
Microscopy Studies on Magnetic Domains in a Magnetostrictive Fe-Ga Alloy【国内学会/口頭発表】 富田雄人, 玉岡武泰, 阿内三成, 村上恭和, 小野暢久, 畑山正寿, 岡本聡, Y. U. Wang, Y. M. Jin 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
Core loss reduction of soft magnetic materials by nanostructure engineering【国内学会/招待講演】 H. Sepehri-Amin, R. Gautam, S. Hiramoto, H. Mamiya, S. Okamoto, T. Miyatake, T. Ohkubo 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
Core loss reduction of Fe-based amorphous alloys by formation of Cu clusters【国内学会/口頭発表】 R. GAUTAMN, H. Sepehri-Amin, S. Hiramoto, H. Mamiya, S. Okamoto, T. Miyatake, T. Ohkubo 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
Recent progress in soft magnetic composite materials 【国内学会/招待講演】 P. Nguyen, S. Yoshida, S. Okamoto, S. Muroga, T. Miyazaki, Y. Endo 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
材料ならびに透磁率の異なる各種磁性コアの直流バイアス特性 【国内学会/口頭発表】 大沼智幸, 小野暢久, 岡本聡 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
磁歪によるランダム磁気異方性とエネルギー損失機構の解明 【国内学会/口頭発表】 塚原宙, H. Haodong, 鈴木清策, 小野寛太, 岡本聡 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
時間発展系拡張型ランダウ自由エネルギーモデルによる高速磁化反転過程のエネルギー損失解析 【国内学会/ポスター発表】 西岡宏祐, L. F. Alexandre, 三俣千春, 山崎貴大, 岡本聡, 大林一平, 平岡裕章, 小嗣真人 日本金属学会2024年春期第174回講演大会, 東京, Mar. 12th-15th, 2024
Pt/Co/IrMn 多層膜における磁化および交換バイアスのスピン起動トルク反転の時間分解観測 【国内学会/ポスター発表】 谷口卓也, Y. Wang, P.-H. Lin, D. Zicchino, A. Nickl, J. Sahliger, C.-H. Lai, C. Song, H. Wu, Q. Dai, C. Back Spin-RNJ シンポジウム 2023, 仙台, Mar. 17th-18th, 2024
磁性材料関連の研究会をふりかえって 【国内学会/招待講演】 岡本聡 アモルファス・ナノ材料と応用 第147委員会 第155回研究会, 東京, Mar. 6th, 2024
3D Visualizatio of the Magnetic Domain Structure Inside Advanced Permanent Magnets using X-ray Magnetic Tomography 【国際学会/招待講演】 S. Okamoto, T. Suwa, K. Ishigami, T. Taniguchi, M. Suzuki MRM2023/IUMRS-ICA2023, Kyoto, JP, Dec. 11th-16th, 2023
Current-induced Nonlinear Spin Polarization in Ta/FeNi/Pt Spintronic Metamaterial 【国際学会/ポスター発表】 T. Kodama, N. Kikuchi, T. Chiba, S. Okamoto, S. Ohno, S. Tomita The Symposium of crc-gp-mssp 2023, Sendai, JP, Nov. 28nd-Dec. 1st, 2023
Time-resolved Observation of Spin-orbit Torque Switching of Magnetization and Exchange Bias in Pt/Co/IrMn Multilayers 【国際学会/ポスター発表】 T. Taniguchi, Y. Wang, P.-H. Lin, D. Zicchino, A. Nickl, J. Sahliger, C.-H. Lai, C. Song, H. Wu, Q. Dai, C. Back The Symposium of crc-gp-mssp 2023, Sendai, JP, Nov. 28nd-Dec. 1st, 2023
Multiscale and Multimodal Analyses on Coercivity Mechanism of Permanent Magnets 【国際学会/招待講演】 S. Okamoto KMS 2023 Winter Conference, Busan, KR, Nov. 22nd-24th, 2023
Magnetic Imaging Using a Synchrotron Radiation Light 【国際学会/招待講演】 S. Okamoto IEC TC51, Sendai, JP, Nov. 14th-16th, 2023
Magnetic properties of Fe-Ni powder core for high frequency device applications 【国際学会/ポスター発表】 M. Nguyen, S. Yoshida, S. Okamoto, T. Miyazaki, Y. Endo MMM 2023, Dallas, US, Oct. 30ht-Nov. 3rd, 2023
Evaluation of structure and magnetic properties in amorphous dust core for high frequency device application 【国際学会/ポスター発表】 M. Nguyen, S. Yoshida, S. Okamoto, T. Miyazaki, Y. Endo MMM 2023, Dallas, US, Oct. 30ht-Nov. 3rd, 2023
Observation of exchange bias switching using time-resolved magneto-optical Kerr microscopy 【国内学会/招待講演】 T. Taniguchi, Y. Wang, P. Lin, D. Zicchino, A. Nickl, J. Sahliger, C. Lai, C. Song, H. Wu , Q. Dai, C. Back 第47回日本磁気学会, 大阪, Sep. 27th-29th, 2023
Understanding the Coercivity of Ga-containing Nd–Fe–B Sintered Magnets from Feature Extraction and Selection of X-ray Diffraction Patterns via Dimension Reduction and Sparse Modeling 【国際学会/口頭発表】 K. Ishigami, T. Onuma, A. Kato, M. Yano, T. Shoji, T. Nakamura, S. Okamoto REPM 2023 BIRMINGHAM, Birmingham, UK, Sep. 3rd-7th, 2023
Feature extraction of 3D real pictures of microstructure and magnetic domain in a Tb diffused Nd-Fe-B sintered magnet 【国際学会/ポスター発表】T. Suwa, K. Ishigami, M. Suzuki, S. Okamoto REPM 2023 BIRMINGHAM, Birmingham, UK, Sep. 3rd-7th, 2023
スピン軌道トルクによる磁化反転と交換バイアス反転の経時観測 【国内学会/口頭発表】 谷口卓也, Y. Wang, P. Lin, D. Zicchino, A. Nickl, J. Sahliger, H. Wu, Q. Dai, C. Back 電気学会マグネティクス研究会, 札幌, Aug. 8th-9th, 2023
Spin-current Driven Magnetic Meta-atoms for TimeVarying Permeability 【国際学会/ポスター発表】 R. Shimizu, T. Kodama, N. Kikuchi, S. Okamoto, S. Ohno, S. Tomita Intermag 2023, Sendai, JP, May 15th-18th, 2023
Understanding the Coercivity of Ga-containing Nd-Fe-B Sintered Magnets from Feature Extraction and Selection of X-ray Diffraction Patterns by Dimension Reduction and Sparse Modelling 【国際学会/口頭発表】 K. Ishigami, T. Onuma, A. Kato, M. Yano, T. Shoji, T. Nakamura, S. Okamoto Intermag 2023, Sendai, JP, May 15th-18th, 2023
Feature analysis on B-H curves of dust cores under the application of DC bias field 【国際学会/ポスター発表】 T. Onuma, Z. Li, S. Okamoto Intermag 2023, Sendai, JP, May 15th-18th, 2023
Analysis on Iron Loss of Sendust Dust Cores based on Magnetization Reversal Processes 【国際学会/ポスター発表】 N. Ono, Y. Uehara, Y. Endo, S. Yoshida, N. Kikuchi, S. Okamoto Intermag 2023, Sendai, JP, May 15th-18th, 2023
Evaluation of microstructure and magnetic performance of Fe- 6.5 wt% Si soft magnetic powder core 【国際学会/口頭発表】 M. Nguyen, S. Yoshida, S. Okamoto, T. Miyazaki, Y. Endo Intermag 2023, Sendai, JP, May 15th-18th, 2023
Accuracy Investigation of High-Frequency Core Loss Measurement for Low-Permability Magnetic Materials 【国際学会/口頭発表】 Y. Sato, Y. Uehara, S. Okamoto, S. Yoshida, Y. Endo, N. Ono, H. Matsumoto Intermag 2023, Sendai, JP, May 15th-18th, 2023
Permeability Control of Ferromagnetic Wires for Timevarying Spintronic Metamaterials 【国際学会/口頭発表】 T. Kodama, N. Kikuchi, S. Okamoto, S. Ohno, S. Tomita Intermag 2023, Sendai, JP, May 15th-18th, 2023
Effect of film thickness on microwave assisted switching behavior 【国際学会/口頭発表】 N. Kikuchi, K. Sato, M. Hatayama, T. Shimatsu, S. Okamoto Intermag 2023, Sendai, JP, May 15th-18th, 2023
Challenges to high magnetic flux density and low loss magnetic materials and devices for next-generation power electronics 【国際学会/招待講演】 S. Okamoto, N. Ono, T. Onuma, Z. Li, Y. Uehara, Anton Bolyachkin, H. Sepehri-Amin, T. Ohkubo Intermag 2023, Sendai, JP, May 15th-18th, 2023
Ring-shaped multi-bandpass spin wave filter using YIG film 【国際学会/口頭発表】 T. Taniguchi, M. Lindner, C. Riedel, C. Back Intermag 2023, Sendai, JP, May 15th-18th, 2023
硬X線磁気トモグラフィーによる先端永久磁石の磁気ヒステリシス解析 【国内学会/招待講演】 岡本聡 2022年度 ナノスピントロニクス研究会・機能磁性材料分光研究会 合同研究会, 吹田, Mar. 28th, 2023
Permeability Control using Spin-Hall Effects for Time-varying Metamaterials 【国際学会/ポスター発表】 T. Kodama, H. Kurosawa, S. Ohno, N. Kikuchi, M. Hatayama, S. Okamoto, S. Tomita The 6th Symposium for the Core Research Clusters for Materials Scienceand Spintronics, and the 5th Symposium on International Joint Graduate Program in Materials Science, ONLINE, Oct. 24th-27th, 2022
Approaches of Ultra-Low Iron Loss in Magnetic Materials and Devices for Power Electronics 【国際学会/招待講演】 S. Okamoto International Conference on Fine Particle Magnetism (ICFPM2022), Yokohama, JP, Oct. 16th-21st, 2022
THERMAL ACTIVATION ON MICROWAVE ASSISTED MAGNETIZATION SWITCHING IN Co/Pt NANODOT ARRAYS 【国際学会/口頭発表】 S. Mizutani, N. Kikuchi, M. Hatayama, T. Shimatsu, S. Okamoto Magnetics and Optics Research International Symposium 2022, Shimane, JP, May 16th-19th, 2022
COBALT/PLATINUM SUPERLATTICES TOWARDS TIME-VARYING METAMATERIALS 【国際学会/ポスター発表】 S. Tomita, N. Kikuchi, S. Okamoto Magnetics and Optics Research International Symposium 2022, Shimane, JP, May 16th-19th, 2022
Microwave assisted switching in granular media with continuous capping layers for interaction control 【国際学会/ポスター発表】 N. Kikuchi, K. Sato, T. Shimatsu, O. Kitakami, S. Okamoto Magnetics and Optics Research International Symposium 2022, Shimane, JP, May 16th-19th, 2022
Ultra-low loss magnetic materials for innovative power electronics 【国際学会/招待講演】 S. Okamoto International Power Electronics Conference, Himeji, JP, May 15th-19th, 2022
永久磁石材料におけるマルチスケール磁化過程解析 【国内学会/招待講演】 岡本聡 令和４年電気学会全国大会, オンライン, Mar. 21st-23rd, 2022
極微細粒Nd-Fe-B焼結磁石を用いたヒステリシス3次元磁区観察 【国内学会/口頭発表】 岡本聡, 竹内誠, 小林慎太郎, 小谷佳範, 中村哲也, 菊池伸明, A Bolyachkin, H Sepehri-Amin, 大久保忠勝, 宝野和博, 宇根康裕, 鈴木基寛 日本金属学会2022年春期第170回講演大会, オンライン, Mar. 15th-17th, 22, 2022
Physical origin of bimodal complex permeability spectrum of a noise-suppression sheet 【国際学会/口頭発表】 T. Igarashi, S. Tamaru, N. Kikuchi, S. Yoshida, S. Okamoto 2022 Joint MMM-Intermag Conference, Hybrid event: New Orleans, LA, US, Jan. 10th-14th, 2022
3D magnetic domain imaging along magnetic hysteresis using a Tb-Cu diffused Nd-Fe-B PLP magnet 【国際学会/招待講演】 S. Okamoto The CMSM-ESICMM Permanent Magnet Seminar, ONLINE, Dec. 17th, 2021
Magnetic-tomography measurement on a Nd-Fe-B magnet 【国際学会/招待講演】 S. Okamoto The 3rd International Joint Symposium of 5-star Alliance (Japan), CEFMSNCTU, RCAS-AS (Taiwan), ONLINE, Nov. 17th, 2021
Thermal activation on microwave assisted magnetization switching in Co/Pt nanodot arrays 【国際学会/ポスター発表】 S. Mizutani, N. Kikuchi, M. Hatayama, T. Shimatsu, S. Okamoto The 5th Symposium for The Core Research Clusters for Materials Science and Spintronics, and the 4th Symposium on International Joint Graduate Program in Materials Science, ONLINE, Oct. 25th-28th, 2021
Field Angle Effect on Microwave Assisted Magnetization Switching 【国際学会/ポスター発表】 N. Kikuchi, S. Okamoto, T. Shimatsu The 4th International Symposium for The Core Research Cluster for Spintronics, ONLINE, Feb. 24th-25th, 2021
Frequency-domain microwave spectroscopy of Co/Pt superlattice metamaterials 【国際学会/ポスター発表】 S. Tomita, N. Kikuchi, M. Hatayama, S. Okamoto The 4th International Symposium for The Core Research Cluster for Spintronics, ONLINE, Feb. 24th-25th, 2021
Visualization of the magnetization reversal processes in He jet-milled Nd-Fe-B sintered magnet by X-ray magnetic tomography 【国内学会/招待講演】 M. Suzuki, M. Takeuchi, S. Kobayashi, R. Haga, Y. Kotani, T. Nakamura, N. Kikuchi, T. Sasaki, T. Ohkubo, Y. Une, S. Okamoto 第44回日本磁気学会学術講演会, オンライン, Dec. 14th-17th, 2020
Microwave-Assisted Magnetization Switching Behaviors in Granular Media 【国際学会/招待講演】 S. Okamoto, N. Kikuchi, T. Shimatsu The 31st Magnetic Recording Conference (TMRC), VIRTUAL MEETING, Aug. 17th-20th, 2020
