14 citations · 31 across the 5 of their papers we have counts for
5 papers
Spin-orbit torque driven motion of chiral domain walls induced by radial magnetization in nanotube geometry
Nobuyuki Umetsu, Hiroki Tokuhira, Michael Quinsat +3
We theoretically investigate chiral domain walls (DWs) formed in radially magnetized nanotubes composed of ultrathin layers with perpendicular magnetic anisotropy (PMA). Unlike tho…
Spin orbit torque-driven motion of quasi-Bloch domain wall in perpendicularly magnetized W/CoFeB/MgO structure
Nobuyuki Umetsu, Michael Quinsat, Susumu Hashimoto +2
The motion of chiral magnetic domain walls (DWs) driven by spin-orbit torque (SOT) has been extensively studied in heavy metal/ferromagnet heterostructures with perpendicular magne…
Exchange stiffness proportional to power of magnetization in permalloy co-doped with Mo and Cu
Shiho Nakamura, Nobuyuki Umetsu, Michael Quinsat +1
The exchange stiffness of magnetic materials is one of the essential parameters governing magnetic texture and its dynamics in magnetic devices. The effect of single-element doping…
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…
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…