2015/03/24 by Nobuyuki Umetsu, Daisuke Miura, Akimasa Sakuma · 3 citations
Physics and Astronomy · #Condensed matter physics #Coupling (piping) #Electron #Ferromagnetism #Magnetic field #Magnetic properties of thin films #Magnetization #Materials science #Physics #Physics of Superconductivity and Magnetism #Precession #Quantum and electron transport phenomena #Quantum mechanics #Rashba effect #Spin (aerodynamics) #Spin Hall effect #Spin polarization #Spin wave #Spintronics #Spin–orbit interaction #Torque #cond-mat.mes-hall #cond-mat.mtrl-sci
paper · pdf · doi:10.1103/physrevb.91.174440
published in Physical Review B 91(17) (American Physical Society) · 16 pages, 7 figures
arxiv created 2015/03/24 · openalex publication_date 2015/05/29 · arxiv updated 2015/12/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 linear-response theory, and we calculate the dynamic spin torque by considering the impurity-ladder-sum vertex corrections. This dynamic spin torque is divided into three terms: a damping term, a distortion term, and a correction term for the equation of motion. The distorting torque describes a phenomenon unique to the Rashba spin-orbit coupling system, where the distorted motion of magnetization precession is subjected to the anisotropic force from the Rashba coupling. The oscillation mode of the precession exhibits an elliptical trajectory, and the ellipticity depends on the strength of the nesting effects, which could be reduced by decreasing the electron lifetime.