Spin transfer torque on magnetic insulators
Department of Physics, Beijing Normal University - Beijing 100875, China
2 Institute for Materials Research, Tohoku University - Sendai 980-8577, Japan
3 Delft University of Technology, Kavli Institute of NanoScience - 2628 CJ Delft, The Netherlands, EU
Accepted: 17 August 2011
Recent experimental and theoretical studies focus on spin-mediated heat currents at interfaces between normal metals and magnetic insulators. We resolve conflicting estimates for the order of magnitude of the spin transfer torque by first-principles calculations. The spin mixing conductance G↑↓ of the interface between silver and the insulating ferrimagnet Yttrium Iron Garnet (YIG) is dominated by its real part and of the order of 1014 Ω−1 m−2, i.e. close to the value for intermetallic interface, which can be explained by a local spin model.
PACS: 72.25.Mk – Spin transport through interfaces / 72.10.-d – Theory of electronic transport; scattering mechanisms / 85.75.-d – Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields
© EPLA, 2011