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Controlling Antiferromagnetic Magnon Polarization by Interfacial Exchange Interaction

Yawen Liu1,†, Haoyu Liu1,†, Wei Yuan1, Yuhang Li2, Junxue Li1, Qiming Shao3, Ran Cheng2,1, and Jing Shi1,*

  • 1Department of Physics and Astronomy, University of California, Riverside, California 92521, USA
  • 2Department of Electrical and Computer Engineering, University of California, Riverside, California 92521, USA
  • 3Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Hong Kong, China

  • *jing.shi@ucr.edu
  • †Y. Liu and H. Liu contributed equally to this work.
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Phys. Rev. Applied 18, 034005 – Published 2 September, 2022

DOI: https://doi.org/10.1103/PhysRevApplied.18.034005

Abstract

We demonstrate highly efficient control of antiferromagnetic (AFM) magnon spins by the interfacial exchange interaction in heterostructures of ferrimagnetic yttrium iron garnet (YIG) and AFM Cr2O3. At low temperatures, Cr2O3 is antiferromagnetically ordered. The interfacial exchange interaction exerted by YIG lifts the degeneracy between the AFM magnon modes in Cr2O3, resulting in a net spin polarization and a spin current dominated by left-handed magnons, even at zero magnetic field, which is detected by the spin Seebeck effect with a 5-nm-thick Pt film. In the AFM magnon-dominated region, even if the magnetic field is not sufficiently strong to induce the spin-flop transition in Cr2O3, the total spin Seebeck signal polarity flips when the YIG magnetization switches. It clearly indicates that the Cr2O3 magnon polarization is controlled by YIG magnetization through the interfacial exchange interaction. The demonstration of the efficient control of AFM magnon polarization opens a pathway to manipulate AFM magnon quantum states using FM-AFM heterostructures.

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Phys. Rev. Applied 18, 034005– Published 2 September, 2022
  • Received 28 September 2021
  • Revised 2 May 2022
  • Accepted 22 July 2022
Article part of CHORUS
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