Electronic control of the spin-wave damping in a magnetic insulator
Hamadeh, A. · Kelly, O. d Allivy · Hahn, C. · Meley, H. · Bernard, R. · Molpeceres, A. H. · Naletov, V. V. · Viret, M. · Anane, A. · Cros, V. · Demokritov, S. O. · Prieto, J. L. · Munoz, M. · de Loubens, G. · Klein, O.
Original · EN
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, Idc, 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 Idc in a 5 μm diameter YIG(20nm)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 3 · 10¹¹A.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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