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arXiv · 1405.7415

Electronic control of the spin-wave damping in a magnetic insulator

A. Hamadeh·O. d Allivy Kelly·C. Hahn·H. Meley·R. Bernard·A. H. Molpeceres·V. V. Naletov·M. Viret·A. Anane·V. Cros·S. O. Demokritov·J. L. Prieto·M. Munoz·G. de Loubens·O. Klein
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Abstract

It is demonstrated that the decay time of spin-wave modes existing in a magnetic insulator can be reduced or enhanced by injecting an in-plane dc current, $I_\text{dc}$, in an adjacent normal metal with strong spin-orbit interaction. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of $I_\text{dc}$ in a 5~$μ$m diameter YIG(20nm){\textbar}Pt(7nm) disk using a magnetic resonance force microscope (MRFM). Complete compensation of the damping of the fundamental mode is obtained for a current density of $\sim 3 \cdot 10^{11}\text{A.m}^{-2}$, in agreement with theoretical predictions. At this critical threshold the MRFM detects a small change of static magnetization, a behavior consistent with the onset of an auto-oscillation regime.

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A. Hamadeh, O. d Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Munoz, G. de Loubens, O. Klein. 2014-05-28. Electronic control of the spin-wave damping in a magnetic insulator. https://doi.org/10.1103/physrevlett.113.197203

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