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Distinguishing antiferromagnetic spin sublattices via the spin Seebeck effect

Yongming Luo1,2, Changjiang Liu2, Hilal Saglam2, Yi Li2, Wei Zhang3, Steven S.-L. Zhang2,4, John E. Pearson2, Brandon Fisher2, Tiejun Zhou1 et al.

Anand Bhattacharya2,* and Axel Hoffmann2,5,†

  • 1School of Electronics and Information, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China
  • 2Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Department of Physics, Oakland University, Rochester, Michigan 48309, USA
  • 4Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA
  • 5Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA

  • *Corresponding author: anand@anl.gov
  • †Corresponding author: axelh@illinois.edu

Phys. Rev. B 103, L020401 – Published 6 January, 2021

DOI: https://doi.org/10.1103/PhysRevB.103.L020401

Abstract

We measured spin Seebeck signals at the top and bottom surfaces of an antiferromagnetic Cr2O3 film, using a Pt/Cr2O3/Pt trilayer. Our experimental data, combined with micromagnetic simulations, clearly demonstrate that the uncompensated sublattice at the top and bottom surfaces plays a decisive role in determining the symmetry of the spin Seebeck signals, providing fundamental insight for understanding the generation of spin Seebeck signal in antiferromagnetic materials.

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