Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque

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. Muñoz, G. de Loubens, and O. Klein
Phys. Rev. Lett. 113, 197203 – Published 7 November 2014

Abstract

It is demonstrated that the threshold current for damping compensation can be reached in a 5μm diameter YIG(20nm)|Pt(7nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of Idc using a magnetic resonance force microscope (MRFM). It is shown that the magnetic losses of spin-wave modes existing in the magnetic insulator can be reduced or enhanced by at least a factor of 5 depending on the polarity and intensity of an in-plane dc current Idc flowing through the adjacent normal metal with strong spin-orbit interaction. Complete compensation of the damping of the fundamental mode by spin-orbit torque is reached for a current density of 3×1011A·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.

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  • Received 28 May 2014

DOI:https://doi.org/10.1103/PhysRevLett.113.197203

© 2014 American Physical Society

Authors & Affiliations

A. Hamadeh1, O. d’Allivy Kelly2, C. Hahn1, H. Meley1, R. Bernard2, A. H. Molpeceres2, V. V. Naletov1,2,3, M. Viret1, A. Anane2, V. Cros2, S. O. Demokritov4,8, J. L. Prieto5, M. Muñoz6, G. de Loubens1,†, and O. Klein1,7,*

  • 1Service de Physique de l’État Condensé (CNRS URA 2464), CEA Saclay, 91191 Gif-sur-Yvette, France
  • 2Unité Mixte de Physique CNRS/Thales and Université Paris Sud 11, 1 avenue Fresnel, 91767 Palaiseau, France
  • 3Institute of Physics, Kazan Federal University, Kazan 420008, Russian Federation
  • 4Department of Physics, University of Muenster, 48149 Muenster, Germany
  • 5Instituto de Sistemas Optoelectrónicos y Microtecnología (UPM), Madrid 28040, Spain
  • 6Instituto de Microelectrónica de Madrid (CNM, CSIC), Madrid 28760, Spain
  • 7SPINTEC, UMR CEA/CNRS/UJF-Grenoble 1/Grenoble-INP, INAC, 38054 Grenoble, France
  • 8Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russia

  • *Corresponding author. oklein@cea.fr
  • gregoire.deloubens@cea.fr

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Vol. 113, Iss. 19 — 7 November 2014

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