CEM Talk: Olivier Klein (CEA-Saclay), “Electronic control of the spin-wave damping in a magnetic insulator”

August 25, 2014 @ 10:00 am – 11:30 am
PRB 1080 (Smith Seminar Room)

Olivier Klein
Service de Physique de l’État Condensé, CEA-Saclay

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

Abstract: We show 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 having a strong spin-orbit interaction[1]. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of Idcin a 5 μm diameter YIG(20nm)|Pt(7nm) disk[2] using a magnetic resonance force microscope (MRFM). Complete compensation of the damping of the fundamental mode is obtained for a current density of ∼3•1011 amps/m2, 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.


[1] http://arxiv.org/abs/1405.7415

[2] C. Hahn et al. APL 104 152410 (2014)