Nonlinear spin conductance of yttrium iron garnet thin films driven by large spin-orbit torque

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Nonlinear spin conductance of yttrium iron garnet thin films driven by large spin-orbit torque

N. Thiery, A. Draveny, V. V. Naletov, L. Vila, J. P. Attané, C. Beigné, G. de Loubens, M. Viret, N. Beaulieu, J. Ben Youssef, V. E. Demidov, S. O. Demokritov, A. N. Slavin, V. S. Tiberkevich, A. Anane, P. Bortolotti, V. Cros, and O. Klein

Phys. Rev. B 97, 060409(R) – Published 26 February 2018

Abstract

We report high power spin transfer studies in open magnetic geometries by measuring the spin conductance between two nearby Pt wires deposited on top of an epitaxial yttrium iron garnet thin film. Spin transport is provided by propagating spin waves that are generated and detected by direct and inverse spin Hall effects. We observe a crossover in spin conductance from a linear transport dominated by exchange magnons (low current regime) to a nonlinear transport dominated by magnetostatic magnons (high current regime). The latter are low-damping magnetic excitations, located near the spectral bottom of the magnon manifold, with a sensitivity to the applied magnetic field. This picture is supported by microfocus Brillouin light-scattering spectroscopy. Our findings could be used for the development of controllable spin conductors by variation of relatively weak magnetic fields.

Received 21 September 2017
Revised 22 January 2018

DOI:https://doi.org/10.1103/PhysRevB.97.060409

Physics Subject Headings (PhySH)

Magnetism Spin caloritronics Spin current Spin torque Spin transfer torque Spin waves Spintronics

Magnetic insulators

Brillouin scattering & spectroscopy

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

N. Thiery¹, A. Draveny¹, V. V. Naletov^1,2, L. Vila¹, J. P. Attané¹, C. Beigné¹, G. de Loubens³, M. Viret³, N. Beaulieu^3,4, J. Ben Youssef⁴, V. E. Demidov⁵, S. O. Demokritov^5,6, A. N. Slavin⁷, V. S. Tiberkevich⁷, A. Anane⁸, P. Bortolotti⁸, V. Cros⁸, and O. Klein^1,*

¹SPINTEC, CEA-Grenoble, CNRS, Université Grenoble Alpes, 38054 Grenoble, France
²Institute of Physics, Kazan Federal University, Kazan 420008, Russian Federation
³SPEC, CEA-Saclay, CNRS, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
⁴LabSTICC, CNRS, Université de Bretagne Occidentale, 29238 Brest, France
⁵Department of Physics, University of Muenster, 48149 Muenster, Germany
⁶Institute of Metal Physics, Ural Division of RAS, Yekaterinburg 620041, Russian Federation
⁷Department of Physics, Oakland University, Michigan 48309, USA
⁸Unité Mixte de Physique CNRS, Thales, Université Paris-Saclay, 91767 Palaiseau, France

^*Corresponding author: oklein@cea.fr

Electrical properties of epitaxial yttrium iron garnet ultrathin films at high temperatures

N. Thiery, V. V. Naletov, L. Vila, A. Marty, A. Brenac, J.-F. Jacquot, G. de Loubens, M. Viret, A. Anane, V. Cros, J. Ben Youssef, N. Beaulieu, V. E. Demidov, B. Divinskiy, S. O. Demokritov, and O. Klein

Phys. Rev. B 97, 064422 (2018)

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Vol. 97, Iss. 6 — 1 February 2018

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