207 citations · 958 across the 36 of their papers we have counts for
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First-principles study on interface magnetic structure in NdFeB/(Fe,Co) exchange spring magnets
Nobuyuki Umetsu, Yuta Toga, Akimassa Sakuma
The magnetic properties of NdFeB (NFB)/transition metal (TM = Fe, Co) multilayer systems are studied on the basis of first-principles density functional calculations…
General Formalism for Magnetic Anisotropy Constants
Daisuke Miura, Ryo Sasaki, Akimasa Sakuma
Direct expressions for the magnetic anisotropy constants are given at a finite temperature from microscopic viewpoints. In the present derivation, it is assumed that the Hamiltonia…
Spin-wave-induced spin torque in Rashba spin-orbit coupling system
Nobuyuki Umetsu, Daisuke Miura, Akimasa Sakuma
We study the effects of Rashba spin-orbit coupling on the spin torque induced by spin waves, which are the plane wave dynamics of magnetization. The spin torque is derived from lin…
Effects of trace elements on the crystal field parameters of Nd ions at the surface of NdFeB grains
Yuta Toga, Tsuneaki Suzuki, Akimasa Sakuma
Using first-principles calculations, we investigate the positional dependence of trace elements such as O and Cu on the crystal field parameter , proportional to the anisotr…
Theoretical evaluation on the temperature dependence of magnetic anisotropy constants of Nd2Fe14B - Effects of exchange field and crystal field strength -
Ryo Sasaki, Daisuke Miura, Akimasa Sakuma
To identify the possible mechanism of coercivity (Hc) degradation of Nd-Fe-B sintered magnets, we study the roles of the exchange field acting on the 4f electrons in Nd ions and th…