Demonstration of a micron-scale spin-orbit-torque emitter for coherent magnonics

ORAL

Abstract

Using micro-focus Brillouin light scattering (BLS), we experimentally demonstrate generation of coherent propagating magnons in ultra-thin magnetic-insulator films by spin-orbit torque induced by dc electric current [1]. We show that this challenging task can be accomplished by utilizing magnetic-insulator films with large perpendicular magnetic anisotropy (PMA) possessing ultra-low Gilbert damping ( ≈ 8 10-4 for 20 nm thick Bismuth substituted YIG [2]). Fine tuning of the PMA allows to exactly cancel the dipolar field (the effective magnetization Meff ≈ 0). As a result, the usually observed non-linear shift of the auto-oscillation frequency is suppressed. Hence, the dominant mechanism for self-localization of the auto-oscillations is inhibited. We demonstrate simple and versatile spin-orbit torque devices, which can be used as highly efficient nanoscale sources of coherent propagating magnons for insulator-based spintronic applications.

[1] M. Evelt et al., “Emission of coherent propagating magnons by insulator-based spin-orbit torque oscillators”. Phys. Rev. Applied 10, 041002 (2018)
[2] L. Soumah et al., Ultra-low damping insulating magnetic thin films get perpendicular. Nat. Commun. 9, 3355 (2018).

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Presenters

  • Abdelmadjid Anane

    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France

Authors

  • Michael Evelt

    • Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, 48149 Muenster, Germany

  • Lucile Soumah

    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France

  • Anatoliy Bronislavovich Rinkevich

    • Institute of Metal Physics, Ural Division of RAS, Ekaterinburg 620108, Russia

  • Sergej Demokritov

    • Physics, University of Muenster
    • Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, 48149 Muenster, Germany
    • University of Münster

  • Jamal Ben Youssef

    • LABSTICC, UMR 6285 CNRS, Universite de Bretagne Occidentale, 29238 Brest, France

  • Gregoire de Loubens

    • SPEC, CEA-Saclay, CNRS, Université Paris-Saclay, 91191 Gif-sur-Yvette, France

  • Olivier Klein

    • SPINTEC, CEA-Grenoble, CNRS and Université Grenoble Alpes, 38054 Grenoble, France

  • Paolo Bortolotti

    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
    • CNRS/Thales

  • Vincent Cros

    • Unité Mixte de Physique, CNRS, Thales, Université Paris-Sud, Université Paris-Saclay, Palaiseau, France
    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France
    • CNRS/Thales
    • Unité Mixte de Physique CNRS/Thales, Univ. Paris-Sud, Université Paris-Saclay, 91767 Palaiseau, France

  • Abdelmadjid Anane

    • Unite Mixte de Physique, CNRS, Thales, Univ. Paris-Sud, Université Paris-Saclay, Palaiseau, France

  • Vladislav Demidov

    • Physics, University of Muenster
    • Institute for Applied Physics and Center for Nonlinear Science, University of Muenster, 48149 Muenster, Germany
    • University of Münster