Research Achievements - Original paper -

Formation of a body-centered tetragonal structure with high magnetic anisotropy and coercivity in Fe–Co–V films with high C contents

T. Hasegawa, T. Nishikawa, C. Shirai

IEEE Transactions on Magnetics   59 ( 11 ) 2100905-1 - 2100905-5   2023.06  [Refereed]

Research paper (journal)   Domestic Co-author

Perpendicular magnetic properties on hcp-Co80Pt20 stacked films with oxide seed layers

Journal of the Japan Institute of Metals and Materials   87 ( 4 ) 139 - 147   2023.04  [Refereed]

Research paper (journal)   Domestic Co-author

Body-centered tetragonal structure in Fe-Co-V-N bulk foils fabricated by rolling and ammonia-gas-nitriding method

T. Hasegawa

Scientific Reports   13   5666-1 - 5666-8   2023.04  [Refereed]

Research paper (journal)   Single author

Polarization transformation and destructive interference on subwavelength magnetic domains in magneto‑plasmonic systems

H. Yamane, S. Yanase, T. Hasegawa, M. Kobayashi, Y. Yasukawa

Scientific Reports   12   13871-1 - 13871-10   2022.08  [Refereed]

Research paper (journal)   Domestic Co-author

TEM-based crystal structure analysis of body-centered tetragonal structure in non-epitaxial FeCo film with added V and N

T. Hasegawa, Y. Seki

Materials Letters   313   131734-1 - 131734-3   2022.01  [Refereed]

Research paper (journal)   Domestic Co-author

Effect of V addition on the body-centered cubic to body-centered tetragonal to face-centered cubic structural transformation of N-containing Fe and FeCo films

T. Hasegawa, C. Shirai

Thin Solid Films   739   138990-1 - 138990-5   2021.11  [Refereed]

Research paper (journal)   Domestic Co-author

Challenges toward development of rear-earth free FeCo based permanent magnet

T. Hasegawa

Electronics and Communications in Japan   104 ( 2 ) 1 - 8   2021.03  [Refereed]  [Invited]

Research paper (journal)   Single author

MFM observation of high coercivity in nanostructured tetragonally distorted FeCo films

T. Hasegawa, Le Duy Long, Y. Nakamura

IEEE Transactions on Magnetics   57 ( 2 ) 6500105-1 - 6500105-5   2020.07  [Refereed]

Research paper (journal)   Domestic Co-author

TEM observation of nitrogen-tunable bcc-bct-fcc transformation of iron-cobalt with added vanadium

T. Hasegawa, C. Shirai, Y. Takemasa, Y. Seki

AIP Advances   10   015110-1 - 015110-5   2020.01  [Refereed]

Research paper (journal)   Domestic Co-author

Stabilisation of tetragonal FeCo structure with high magnetic anisotropy by the addition of V and N elements

T. Hasegawa, T. Niibori, Y. Takemasa, M. Oikawa

Scientific Reports   9   5248-1 - 5248-9   2019.03  [Refereed]

Research paper (journal)   Domestic Co-author

Development of high density magnetic recording media

T. Hasegawa

The Journal of the Institute of Electrical Engineers of Japan (IEEJ Journal)   139 ( 1 ) 14 - 17   2019.01  [Invited]

Research paper (journal)   Single author

Fabrication and magnetization reversal of L10 FeMnPt dots surrounded by paramagnetic A1 phase formed by ion irradiation

T. Hasegawa, K. Sasaki, C. W. Barton, T. Thomson

Scripta Materialia   142   6 - 9   2018.04  [Refereed]

Research paper (journal)   International Co-author

Uniaxial magnetic anisotropy of tetragonal FeCoV and FeCoVC films

K. Takahashi, M. Sakamoto, K. Kumagai, T. Hasegawa, and S. Ishio

Journal of Physics D: Applied Physics   51 ( 6 ) 065005-1 - 065005-9   2018.04  [Refereed]

Research paper (journal)   Domestic Co-author

Conversion of FeCo from soft to hard magnetic material by lattice engineering and nanopatterning

T. Hasegawa, S. Kanatani, M. Kazaana, K. Takahashi, K. Kumagai, M. Hirao, S. Ishio

Scientific Reports   7   13215-1 - 13215-7   2017.10  [Refereed]

Research paper (journal)   Domestic Co-author

Structural dependent ferromagnetic-nonmagnetic phase change in FePtRu films

T. Hasegawa, K. Ito

Advances in Materials Science and Engineering   2017   8949458-1 - 8949458-7   2017.07  [Refereed]  [Invited]

Research paper (journal)   Domestic Co-author

Structural control of ultra-fine CoPt nanodot arrays via electrodeposition process

S. Wodarz, T. Hasegawa, S. Ishio, T. Homma

Journal of Magnetism and Magnetic Materials   430   52 - 58   2017.05  [Refereed]

Research paper (journal)   Domestic Co-author

DOI

Uniaxial magnetic anisotropy of tetragonal FeCo based alloy films

S. Ishio, T. Hasegawa, S. Yoshida, S. Kanatani, K. Takahashi, K. Kumagai, M. Hirao

Magnetics Japan   12 ( 1 ) 21 - 25   2017.02  [Invited]

Research paper (journal)   Domestic Co-author

Correlation between crystal planes and disordering of ordered L10 FePt structure caused by ion irradiation

T. Hasegawa, T. Yamazaki, and S. Ishio

Materials Letters   178   243 - 247   2016.05  [Refereed]

Research paper (journal)   Domestic Co-author

Microstructure of L10 FePt thin films with anisotropic interfacial energy coefficients and anisotropic atomic mobilities

L. Liu, L. Zhang, L. Liang, K. Ohsasa, T. Koyama, Q. Sheng, T. Hasegawa, S. Ishio

Journal of Alloys and Compounds   682   176 - 179   2016.04  [Refereed]

Research paper (journal)   Domestic Co-author

Microfabrication of FeMnPt films involving magnetic phase change due to structural transformation caused by ion irradiation

T. Hasegawa, R. Kasahara, K. Sasaki, and S. Ishio

Physica Status Solidi - Rapid Research Letters   10 ( 6 ) 498 - 502   2016.04  [Refereed]

Research paper (journal)   Domestic Co-author