Y
Y. Fukuma
Researcher at Global Alliance in Management Education
Publications - 9
Citations - 435
Y. Fukuma is an academic researcher from Global Alliance in Management Education. The author has contributed to research in topics: Micromagnetics & Spin polarization. The author has an hindex of 4, co-authored 9 publications receiving 349 citations. Previous affiliations of Y. Fukuma include Kyushu Institute of Technology.
Papers
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Journal ArticleDOI
Fermi-level-dependent charge-to-spin current conversion by Dirac surface states of topological insulators
Kouta Kondou,Ryutaro Yoshimi,Atsushi Tsukazaki,Y. Fukuma,Y. Fukuma,Jobu Matsuno,Kei S. Takahashi,Masashi Kawasaki,Masashi Kawasaki,Yoshinori Tokura,Yoshinori Tokura,Yoshichika Otani,Yoshichika Otani +12 more
TL;DR: In this paper, the spin-momentum locking of Dirac surface states offers intriguing possibilities for converting between charge and spin currents, and experiments show that fine tuning of the Fermi level is critical for maximizing the efficiency of such conversions.
Journal ArticleDOI
Gyration mode splitting in magnetostatically coupled magnetic vortices in an array
TL;DR: In this article, the authors present the experimental observation of gyration mode splitting by the time-resolved magneto-optical Kerr effect in an array consisting of magnetostatically coupled Ni81Fe19 discs of 1 µm diameter, 50nm thickness and inter-disc separations varying between 150 and 270nm.
Journal ArticleDOI
Benchtop time-resolved magneto-optical Kerr magnetometer
TL;DR: The construction and application of a compact benchtop time-resolved Kerr magnetometer to measure the magnetization precession in magnetic thin films and lithographically patterned elements and dynamics at two different time scales are presented.
Journal ArticleDOI
Anisotropy in collective precessional dynamics in arrays of Ni80Fe20 nanoelements
Bivas Rana,Dheeraj Kumar,Saswati Barman,Semanti Pal,Ruma Mandal,Y. Fukuma,Yoshichika Otani,Satoshi Sugimoto,Anjan Barman +8 more
TL;DR: In this paper, the anisotropy in the collective precessional dynamics with the variation of azimuthal angle of the bias magnetic field is studied in arrays of permalloy (Ni80Fe20) nanoelements by an all-optical time-resolved Kerr microscope.
Patent
Memory cell, and magnetic memory element
TL;DR: In this article, the authors proposed a memory cell that stores information depending on whether the direction of magnetization of the ferromagnetic layer 12 and that of the free layer 15 are nearly parallel with each other or nearly non-parallel with the other.