Bulletin of the American Physical Society
APS March Meeting 2014
Volume 59, Number 1
Monday–Friday, March 3–7, 2014; Denver, Colorado
Session A8: Focus Session: Magnetodynamics: Generation and Application
8:00 AM–11:00 AM,
Monday, March 3, 2014
Sponsoring Unit: GMAG
Chair: Jeffrey Grossman, Massachusetts Institute of Technology
Abstract ID: BAPS.2014.MAR.A8.1
Abstract: A8.00001 : Spin transfer torque excited spin-waves in metal--magnetic insulator bilayer*
8:00 AM–8:36 AM
Preview Abstract Abstract
(Department of Physics, The University of Hong Kong)
We develop a self-consistent theory for current-induced spin-wave excitations in normal metal-magnetic insulator bilayer structures. We compute the spin-wave dispersion and dissipation, including dipolar and exchange interactions in the magnet, the spin diffusion in the normal metal, as well as the surface anisotropy, spin-transfer torque, and spin pumping at the interface. We find that (1) the spin-transfer torque and spin pumping affect the surface modes more than the bulk modes; (2) spin pumping inhibits high-frequency spin-wave modes, thereby redshifting the excitation spectrum; (3) easy-axis surface anisotropy induces a new type of surface spin wave, which reduces the excitation threshold current and greatly enhances the excitation power. We propose that the magnetic insulator surface can be engineered to create spin-wave circuits utilizing surface spinwaves as information carriers.
*This work was supported in part by the Seed Funding Program for Basic Research and University Grants Committee of Hong Kong (Contract No. AoE/P-04/08).
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2014.MAR.A8.1
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