Zobrazeno 1 - 10
of 162
pro vyhledávání: '"Hisazumi, Akai"'
Autor:
Alexander Kovacs, Johann Fischbacher, Harald Oezelt, Alexander Kornell, Qais Ali, Markus Gusenbauer, Masao Yano, Noritsugu Sakuma, Akihito Kinoshita, Tetsuya Shoji, Akira Kato, Yuan Hong, Stéphane Grenier, Thibaut Devillers, Nora M. Dempsey, Tetsuya Fukushima, Hisazumi Akai, Naoki Kawashima, Takashi Miyake, Thomas Schrefl
Publikováno v:
Frontiers in Materials, Vol 9 (2023)
Rare-earth elements like neodymium, terbium and dysprosium are crucial to the performance of permanent magnets used in various green-energy technologies like hybrid or electric cars. To address the supply risk of those elements, we applied machine-le
Externí odkaz:
https://doaj.org/article/ba3de6b1961f495380a13d05ea592dea
Autor:
Seiji Miyashita, Masamichi Nishino, Yuta Toga, Taichi Hinokihara, Ismail Enes Uysal, Takashi Miyake, Hisazumi Akai, Satoshi Hirosawa, Akimasa Sakuma
Publikováno v:
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 658-682 (2021)
To study the temperature dependence of magnetic properties of permanent magnets, methods of treating the thermal fluctuation causing the thermal activation phenomena must be established. To study finite-temperature properties quantitatively, we need
Externí odkaz:
https://doaj.org/article/4369a53b929d4b6ca3a8fb097a0ac5f7
Publikováno v:
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 543-556 (2021)
First-principles calculation based on density functional theory is a powerful tool for understanding and designing magnetic materials. It enables us to quantitatively describe magnetic properties and structural stability, although further methodologi
Externí odkaz:
https://doaj.org/article/9dc1729251804c138a46516c53fbaf7c
Autor:
Seiji MIYASHITA, Masamichi NISHINO, Yuta TOGA, Taichi HINOKIHARA, Ismail Enes UYSAL, Takashi MIYAKE, Hisazumi AKAI, Satoshi HIROSAWA, Akimasa SAKUMA
Publikováno v:
Journal of the Japan Society of Powder and Powder Metallurgy. 69:S126-S146
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2ae903c7a9763577b8ea2f62f58d2de7
https://doi.org/10.2497/jjspm.69.s126
https://doi.org/10.2497/jjspm.69.s126
Autor:
Yuta Toga, Takashi Miyake, Satoshi Hirosawa, Ismail Enes Uysal, Hisazumi Akai, Masamichi Nishino, Akimasa Sakuma, Taichi Hinokihara, Seiji Miyashita
Publikováno v:
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 658-682 (2021)
To study the temperature dependence of magnetic properties of permanent magnets, methods of treating the thermal fluctuation causing the thermal activation phenomena must be established. To study finite-temperature properties quantitatively, we need
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e63346af01d89f4fc7a7473f161d68eb
https://doaj.org/article/4369a53b929d4b6ca3a8fb097a0ac5f7
https://doaj.org/article/4369a53b929d4b6ca3a8fb097a0ac5f7
Publikováno v:
Science and Technology of Advanced Materials
article-version (VoR) Version of Record
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 543-556 (2021)
article-version (VoR) Version of Record
Science and Technology of Advanced Materials, Vol 22, Iss 1, Pp 543-556 (2021)
First-principles calculation based on density functional theory is a powerful tool for understanding and designing magnetic materials. It enables us to quantitatively describe magnetic properties and structural stability, although further methodologi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::10a53f492c9c2573a1c6622302785e93
https://doi.org/10.1080/14686996.2021.1935314
https://doi.org/10.1080/14686996.2021.1935314
Autor:
Ryo Masuda, Makoto Seto, Tetsuro Ueno, Seiji Sakai, Hisazumi Akai, Takaya Mitsui, Songtian Li, Tetsu Watanuki, Yasuhiro Kobayashi
Publikováno v:
Hyperfine Interactions. 242
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::617f7f8754181031ed54d6f0d2b163b7
https://doi.org/10.1007/s10751-021-01772-0
https://doi.org/10.1007/s10751-021-01772-0
Publikováno v:
Journal of Magnetism and Magnetic Materials. 469:296-301
We present spin-wave dispersion in Sm(Fe$_{1-x}$Co$_x$)$_{12}$ calculated based on first-principles. Anisotropy in the lowest branch of the spin-wave dispersion around the $\Gamma$ point is discussed. Spin-waves propagate more easily along $a^*$-axis
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2bf373be1a9260ce4e3fab4690a208e2
https://doi.org/10.1016/j.jmmm.2018.08.071
https://doi.org/10.1016/j.jmmm.2018.08.071
Autor:
Akira Kato, Tetsuya Shoji, Hisazumi Akai, Noritsugu Sakuma, Shotaro Doi, Munehisa Matsumoto, Naoki Kawashima, Keiichi Tamai, Takashi Miyake, Masaaki Ito, Yosuke Harashima
Publikováno v:
Physical Review Materials. 5
We propose a data assimilation method for evaluating the finite-temperature magnetization of a permanent magnet over a high-dimensional composition space. Based on a general framework for constructing a predictor from two data sets including missing
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c44853126d2da487221147a9ab4089e7
https://doi.org/10.1103/physrevmaterials.5.013806
https://doi.org/10.1103/physrevmaterials.5.013806
Publikováno v:
Physical Review B. 103
We theoretically investigate spin-wave dispersion in rare-earth magnet compounds by using first-principles calculations and a method we call the reciprocal-space algorithm. The value of the calculated exchange stiffness for ${\mathrm{Nd}}_{2}{\mathrm
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::48fba1d2dbcbd6461747caf517000302
https://doi.org/10.1103/physrevb.103.024418
https://doi.org/10.1103/physrevb.103.024418