Faculty Profiles - TAKEZAWA Masaaki

Papers - TAKEZAWA Masaaki

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Magnetic Domain Observation of Milled Nanocrystalline Alloy Powder Reviewed International journal

Takezawa M., Nagaki T., Motozuka S., Sasaki I., Ando Y., Narahara H., Mori N., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T.

IEEE Transactions on Magnetics ( IEEE ) 59 ( 11 ) 2023.06

Observation of Magnetic Domains in Amorphous Magnetic Wires with a Diameter of 10 μm Used in GSR Sensors Reviewed International journal

Takezawa M., Harada Y., Honkura Y., Honkura S.

Sensors 23 ( 7 ) 3506-1 - 3506-9 2023.03

Magnetic Domain Observation of Milled Nanocrystalline Alloy Powder Reviewed International journal

Takezawa M., Nagaki T., Motozuka S., Sasaki I., Ando Y., Narahara H., Mori N., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T.

2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings 2023.01

Realization of logic operations via spin-orbit torque driven perpendicular magnetization switching in a heavy metal/ferrimagnet bilayer Reviewed

Jacob Mathew A., Gao Y., Wang J., Mohammadi M., Awano H., Takezawa M., Asada H., Fukuma Y.

Journal of Applied Physics 135 ( 21 ) 2024.06

Effect of Mn doping on magnetic properties, magnetic domain structures and microstructures of 2-17 type Sm-Co magnets Reviewed International journal

Machida H., Fujiwara T., Fujimoto C., Kanamori Y., Inoue K., Takezawa M.

IEEE Transactions on Magnetics 59 ( 11 ) 2023.06

Microstructure and Magnetic Characterization on Ball-milled Fe-based Nanocrystalline Alloy Sheet Reviewed International journal

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings 2023.01

Microstructure and Magnetic Characterization on Ball-Milled Fe-Based Nanocrystalline Alloy Sheet Reviewed International journal

Nagata S., Horibe Y., Hiramoto S., Narahara H., Mori N., Sasaki I., Takezawa M., Ando Y., Shikayama T., Mukai S., Maeda S., Sakima S., Ishii T., Motozuka S.

Digests of the Intermag Conference 2023-May 2023.01

Recent Topics of Magnetic Domain Observation Technique of Nano-scaled Magnetic Materials Reviewed

Takezawa Masaaki

IEEJ Transactions on Fundamentals and Materials ( The Institute of Electrical Engineers of Japan ) 141 ( 2 ) 112 - 117 2021.02

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

<p>Recent topics of magnetic domain observation technique of nano-scaled magnetic materials were summarized and reported. Magnetic properties of nano-scaled magnetic materials are highly dependent on the magnetic domain structure inside their magnetic materials. Therefore, an observation technique of the magnetic domain structure of magnetic materials is an extremely important field of technology to improve the performance of various devices. Spatial resolution of the domain observation and the observation technique in high magnetic fields were described.</p>

DOI： 10.1541/ieejfms.141.112

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85100296786&origin=inward

Influence of Oxygen or Carbon Impurities on Domain Structure of Sm-Co Magnets Reviewed

Takezawa Masaaki, Sakakura Kenji, Tanaka Jun, Machida Hiroaki, Fujiwara Teruhiko

IEEJ Transactions on Fundamentals and Materials ( The Institute of Electrical Engineers of Japan ) 141 ( 2 ) 133 - 138 2021.02

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal)

<p>Magnetic domain structure changes during a demagnetization process of 2-17 type Sm-Co magnets with different amounts of carbon and oxygen were observed using a Kerr effect microscope. Moreover, the effects of the excess carbon and excess oxygen compositions on the demagnetization process of the magnets were investigated. As a result, it is found that in the Sm-Co magnets with high carbon and oxygen composition, the nucleation of reversal magnetic domains inside grains during the demagnetization process easily occurs at a lower demagnetization field strength. The nucleation of the reversal magnetic domain in grains causes a decrease in a squareness ratio of a demagnetization curve.</p>

DOI： 10.1541/ieejfms.141.133

Scopus

CiNii Article

Other Link： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85100241758&origin=inward

Preface to special issue on “recent topics and future prospect of analysis and creation of structure in nano-scaled magnetic materials”. Reviewed

Takezawa M.

IEEJ Transactions on Fundamentals and Materials 141 ( 2 ) 2021.02

Analysis of Relationships between Crystal Orientation of Grains and Magnetic Domains in Nd-Fe-B Sintered Magnet by Soft X-ray Nano-beam XMCD

Maki Tomohito, Furusawa Daisuke, Nishiuchi Takeshi, Takezawa Masaaki

SPring-8/SACLA Research Report ( Japan Synchrotron Radiation Research Institute ) 9 ( 1 ) 80 - 82 2021.01

Effect of Magnetic Domain Wall Motion on Hysteresis Loss of Soft Magnetic Powder Reviewed

Takamasa SATO, Mikiko FUKASE, Masaaki TAKEZAWA

DENKI-SEIKO ( Daido Steel ) 91 ( 1 ) 13 - 18 2020.07

Magnetic properties and microstructures of high heat-resistance Sm-Co magnets with high Fe and low Zr content Reviewed

Machida H., Fujiwara T., Fujimoto C., Kanamori Y., Sakakura K., Takezawa M.

AIP Advances 9 ( 12 ) 2019.12

Magnetic Domain Structures and Magnetic Properties of Lightly Nd-Doped Sm-Co Magnets with High Squareness and High Heat Resistance Reviewed

55 ( 2 ) 2019.02

研究調査委員会レポート：ナノスケール磁性体の構造・組織解析と創製調査専門委員会

竹澤昌晃

電気学会論文誌．　Ａ ( 一般社団法人電気学会 ) 139 ( 10 ) NL10_5 - NL10_5 2019.01

Magnetic properties and crystal structure of high-purity Fe-(6,6.5,7) mass%Si alloys Reviewed

Matsuyama K., Sasaki I., Nakagawa S., Era H., Takezawa M., Horibe Y., Hata S., Kaidou C., Ogawa T., Kubo S.

2018 IEEE International Magnetic Conference, INTERMAG 2018 2018.10

Change in Magnetic Domain Structure of Nd-Fe-B Sintered Magnets by Compressive Stress Reviewed

203 ( 1 ) 9 - 17 2018.04

Influence of Misorientation Angle Between Adjacent Grains on Magnetization Reversal in Nd-Fe-B-Based Sintered Magnet Reviewed

T. Maki, R. Uchikoshi, R. Ishii, M. Natsumeda, T. Nishiuchi, M. Takezawa

Journal of the Magnetics Society of Japan 42 ( 2 ) 24 - 29 2018.03

Magnetic and Mechanical Properties of the High Purity Fe-3 mass%Si Alloy by Cold Crucible Levitation Melting Reviewed

Nakagawa Shota, Watanabe Ryosuke, Sasaki Iwao, Takezawa Masaaki, Horibe Yoichi, Hata Satoshi, Kaido Chikara, Ogawa Toshifumi, Era Hidenori

Journal of the Japan Institute of Metals and Materials 82 ( 12 ) 476 - 483 2018.01

Magnetic domain structure and demagnetization process of Nd-Fe-B anisotropic HDDR magnetic particles Reviewed International journal

Takezawa M., Nagaishi T., Shimba K., Mishima C., Mitarai H.

2017 IEEE International Magnetics Conference, INTERMAG 2017 2017.08

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Papers - TAKEZAWA Masaaki