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

T Hasegawa, S Kanatani, M Kazaana, K Takahashi… - Scientific reports, 2017 - nature.com
The development of magnetic materials with large uniaxial magnetic anisotropy (K u) and
high saturation magnetization has attracted much attention in various areas such as high …

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, 2019 - nature.com
The development of magnetic materials with high saturation magnetization (M s) and
uniaxial magnetic anisotropy (K u) is required for the realisation of high-performance …

Oblique angle deposited FeCo multilayered nanocolumnar structure: Magnetic anisotropy and its thermal stability in polycrystalline thin films

AS Dev, AK Bera, P Gupta, V Srihari, P Pandit… - Applied Surface …, 2022 - Elsevier
Abstract Iron-Cobalt (FeCo) columnar, multilayered structure is prepared by depositing
several thin FeCo layers by varying the angle between the surface normal and the …

Investigation of the body-centred tetragonal structure of Fe–Co–V–N Bulk foils using the rolling and ammonia-gas-nitriding method

T Hasegawa - Scientific Reports, 2023 - nature.com
Improving the properties of permanent magnets is essential for the advancement of electric
motors in reducing energy consumption and carbon emissions. This study investigated the …

Investigation of Gilbert dam** of a tetragonally distorted ultrathin Fe0. 5Co0. 5 epitaxial film with high magnetic anisotropy

R Mandal, JW Jung, K Masuda, YK Takahashi… - Applied Physics …, 2018 - pubs.aip.org
We have investigated the Gilbert dam**, α, of a tetragonally distorted, perpendicular
magnetic anisotropic (PMA) ultrathin Fe 0.5 Co 0.5 film grown on a Rh-buffered MgO (100) …

Perpendicular magnetic anisotropy in the multilayer fabricated by alternate sputtering of Fe3O4/Cr and post-annealing

D Oshima, S Iwata, T Kato - Journal of Magnetism and Magnetic Materials, 2024 - Elsevier
Magnetic properties of sputter-deposited Fe 3 O 4/Cr multilayers followed by annealing in
vacuum were investigated. The saturation magnetization and perpendicular magnetic …

[HTML][HTML] Fabrication of L1-type FeCo ordered structure using a periodic Ni buffer layer

H Ito, M Saito, T Miyamachi, F Komori, T Koganezawa… - AIP Advances, 2019 - pubs.aip.org
We experimentally prepared a ferromagnet with an L1 0-FeCo ordered structure by inserting
a periodic buffer layer to suppress the B2 structural transition and to maintain the L1 0 …

Estimation of Magnetic Gilbert Dam** at High Temperature: An Approach of Ferromagnetic Resonance Study

R Mandal, Y Sasaki, I Kurniawan, J Jung… - ACS Applied …, 2022 - ACS Publications
High-temperature time-resolved magneto-optical Kerr effect microscopy, an updated version
of the pump-probe laser technique, enables one to measure the magnetization dynamics at …

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, 2021 - Elsevier
In this study, the effect of adding V to N-containing Fe and FeCo on the stability of the body-
centered tetragonal (bct) structure was investigated. The crystal structures of FeN, FeVN …

MFM observation of high coercivity in nanostructured tetragonally distorted FeCo films

T Hasegawa, Y Nakamura - IEEE Transactions on Magnetics, 2020 - ieeexplore.ieee.org
The hard magnetic properties of nanostructured tetragonally distorted FeCo films, which
have a relatively high magnetic anisotropy of~ 10 6 J· m-3, were investigated to reveal the …