Spin wave excitation in magnetic insulators by spin-transfer torque

Details Spin wave excitation in magnetic insulators by spin-transfer torque Spin wave excitation in magnetic insulators by spin-transfer torque

2012-01-17

arxiv.org/abs/1201.3442v1

Physics

Condensed Matter

Materials Science

4 pages, 4 figures

Scientific paper

We study the excitation of spin waves in magnetic insulators by the current-induced spin-transfer torque. We predict preferential excitation of surface spin waves induced by an easy-axis surface anisotropy with critical current inversely proportional to the penetration depth and surface anisotropy. The surface modes strongly reduce the critical current and enhance the excitation power of the current-induced magnetization dynamics.

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