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Spin-phonon interaction in yttrium iron garnet

Kevin S. Olsson1,2,*, Jeongheon Choe1,3,*, Martin Rodriguez-Vega1,3,4,†, Guru Khalsa5, Nicole A. Benedek5, Jiaming He6,7, Bin Fang1,3, Jianshi Zhou3,6,7, Gregory A. Fiete4,8 et al.

Xiaoqin Li1,3,7,‡

  • 1Department of Physics, Center of Complex Quantum Systems, The University of Texas at Austin, Austin, Texas 78712, USA
  • 2Department of Computer and Electrical Engineering, University of Maryland, College Park, Maryland 20740, USA
  • 3Center for Dynamics and Control of Materials, The University of Texas at Austin, Austin, Texas 78712, USA
  • 4Department of Physics, Northeastern University, Boston, Massachusetts 02115, USA
  • 5Department of Materials Science and Engineering, Cornell University, Ithaca, New York 14853, USA
  • 6Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, USA
  • 7Texas Materials Institute, The University of Texas at Austin, Austin, Texas 78712, USA
  • 8Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA

  • *These authors contributed equally to this work.
  • †rodriguezvega@utexas.edu
  • ‡elaineli@physics.utexas.edu

Phys. Rev. B 104, L020401 – Published 1 July, 2021

DOI: https://doi.org/10.1103/PhysRevB.104.L020401

Abstract

Spin-phonon interaction is an important channel for spin and energy relaxation in magnetic insulators. Understanding this interaction is critical for developing magnetic insulator-based spintronic devices. Quantifying this interaction in yttrium iron garnet (YIG), one of the most extensively investigated magnetic insulators, remains challenging because of the large number of atoms in a unit cell. Here, we report temperature-dependent and polarization-resolved Raman measurements in a YIG bulk crystal. We first classify the phonon modes based on their symmetry. We then develop a modified mean-field theory and define a symmetry-adapted parameter to quantify spin-phonon interaction in a phonon-mode specific way in YIG. Based on this improved mean-field theory, we discover a positive correlation between the spin-phonon interaction strength and the phonon frequency.

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