TY - JOUR
T1 - First-principles calculation of spin-orbit torque in a Co/Pt bilayer
AU - Belashchenko, K. D.
AU - Kovalev, Alexey A.
AU - Van Schilfgaarde, M.
PY - 2019/1/1
Y1 - 2019/1/1
N2 - The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is calculated using a first-principles nonequilibrium Green's function formalism with an explicit supercell averaging over Anderson disorder. In addition to the usual dampinglike and fieldlike terms, the odd torque contains a sizable planar Hall-like term (m·E)m×(z×m) whose contribution to current-induced damping is consistent with experimental observations. The dampinglike and planar Hall-like torquances depend weakly on disorder strength, while the fieldlike torquance declines with increasing disorder. The torques that contribute to damping are almost entirely due to spin-orbit coupling on the Pt atoms, but the fieldlike torque does not require it.
AB - The angular dependence of spin-orbit torque in a disordered Co/Pt bilayer is calculated using a first-principles nonequilibrium Green's function formalism with an explicit supercell averaging over Anderson disorder. In addition to the usual dampinglike and fieldlike terms, the odd torque contains a sizable planar Hall-like term (m·E)m×(z×m) whose contribution to current-induced damping is consistent with experimental observations. The dampinglike and planar Hall-like torquances depend weakly on disorder strength, while the fieldlike torquance declines with increasing disorder. The torques that contribute to damping are almost entirely due to spin-orbit coupling on the Pt atoms, but the fieldlike torque does not require it.
UR - http://www.scopus.com/inward/record.url?scp=85060994915&partnerID=8YFLogxK
U2 - 10.1103/PhysRevMaterials.3.011401
DO - 10.1103/PhysRevMaterials.3.011401
M3 - Article
AN - SCOPUS:85060994915
SN - 2475-9953
VL - 3
JO - Physical Review Materials
JF - Physical Review Materials
IS - 1
M1 - 011401
ER -