Scattering theory of charge-current–induced magnetization dynamics
Department of Physics, Norwegian University of Science and Technology - NO-7491, Trondheim, Norway
2 Department of Physics and Astronomy, University of California - Los Angeles, CA 90095, USA
Corresponding author: firstname.lastname@example.org
Accepted: 4 May 2010
In ferromagnets, charge currents can excite magnons via the spin-orbit coupling. We develop a novel and general scattering theory of charge-current–induced macrospin magnetization torques in normal metal|ferromagnet|normal metal layers. We apply the formalism to a dirty GaAs|(Ga, Mn)As|GaAs system. By computing the charge-current–induced magnetization torques and solving the Landau-Lifshitz-Gilbert equation, we find magnetization switching for current densities as low as 5 × 106 A/cm2. Our results are in agreement with a recent experimental observation of charge-current–induced magnetization switching in (Ga, Mn)As.
PACS: 75.78.-n – Magnetization dynamics / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields / 75.50.Pp – Magnetic semiconductors
© EPLA, 2010