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  • Letter
  • Open Access

Anisotropy-assisted magnon condensation in ferromagnetic thin films

Therese Frostad1, Philipp Pirro2, Alexander A. Serga2, Burkard Hillebrands2, Arne Brataas1, and Alireza Qaiumzadeh1

  • 1Center for Quantum Spintronics, Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway
  • 2Fachbereich Physik and Landesforschungszentrum OPTIMAS, Rheinland-Pfälzische Technische Universität Kaiserslautern-Landau, 67663 Kaiserslautern, Germany

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Phys. Rev. Research 6, L012011 – Published 17 January, 2024

DOI: https://doi.org/10.1103/PhysRevResearch.6.L012011

Abstract

We theoretically demonstrate that adding an easy-axis magnetic anisotropy facilitates magnon condensation in thin yttrium iron garnet (YIG) films. Dipolar interactions in a quasi-equilibrium state stabilize room-temperature magnon condensation in YIG. Even though the out-of-plane easy-axis anisotropy generally competes with the dipolar interactions, we show that adding such magnetic anisotropy may even assist the generation of the magnon condensate electrically via the spin-transfer torque mechanism. We use analytical calculations and micromagnetic simulations to illustrate this effect. Our results may explain the recent experiment on Bi-doped YIG and open a pathway toward applying current-driven magnon condensation in quantum spintronics.

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Corrections

30 January, 2024

Correction: A typographical error in the second affiliation and the omission of a support statement in the Acknowledgments have been fixed.

Article Text

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Phys. Rev. Research 6, L012011– Published 17 January, 2024
  • Received 13 September 2023
  • Revised 19 December 2023
  • Accepted 22 December 2023
  • Corrected 30 January 2024
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