Distinct domain reversal mechanisms in epitaxial and polycrystalline antiferromagnetic NiO films from high-field spin Hall magnetoresistance

Motoi Kimata, Takahiro Moriyama, Kent Oda, Teruo Ono

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Magnetic-field-induced domain reversal mechanisms of antiferromagnetic (AF) NiO thin films are investigated by spin Hall magnetoresistance (SMR) measurements. The field strength dependence of SMR amplitudes is measured in epitaxial and polycrystalline NiO films. From the field-dependent behavior of SMR amplitude, two distinct domain reversal mechanisms are found for those NiO films. In the epitaxial films, the conventional monodomain formation against the destressing field due to the magneto-elastic coupling is observed. On the other hand, the thermally assisted domain reversal is dominant in the polycrystalline films. Based on our thermal assisted model, the effective values of domain pinning potential and the number of spins contributing to domain reversal in polycrystalline films are determined. These values are quite important to design AF spin memory devices. This study contributes to building a method to determine the key parameters in AF spintronics with polycrystalline thin films, which are free from the lattice mismatching problem.

Original languageEnglish
Article number192402
JournalApplied Physics Letters
Volume116
Issue number19
DOIs
Publication statusPublished - 2020 May 11

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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