Low-field magnetic anisotropy of Sr2IrO4

Muhammad Nauman, Tayyaba Hussain, Joonyoung Choi, Nara Lee, Young Jai Choi, Woun Kang, Younjung Jo

Research output: Contribution to journalArticlepeer-review

Abstract

Magnetic anisotropy in strontium iridate (Sr2IrO4) is essential because of its strong spin-orbit coupling and crystal field effect. In this paper, we present a detailed mapping of the out-of-plane (OOP) magnetic anisotropy in Sr2IrO4 for different sample orientations using torque magnetometry measurements in the low-magnetic-field region before the isospins are completely ordered. Dominant in-plane anisotropy was identified at low fields, confirming the b axis as an easy magnetization axis. Based on the fitting analysis of the strong uniaxial magnetic anisotropy, we observed that the main anisotropic effect arises from a spin-orbit-coupled magnetic exchange interaction affecting the OOP interaction. The effect of interlayer exchange interaction results in additional anisotropic terms owing to the tilting of the isospins. The results are relevant for understanding OOP magnetic anisotropy and provide a new way to analyze the effects of spin-orbit-coupling and interlayer magnetic exchange interactions. This study provides insight into the understanding of bulk magnetic, magnetotransport, and spintronic behavior on Sr2IrO4 for future studies.

Original languageEnglish
Article number135802
JournalJournal of Physics Condensed Matter
Volume34
Issue number13
DOIs
StatePublished - 30 Mar 2022

Keywords

  • SrIrO
  • magnetic anisotropy
  • spin orbit-coupled magnetic exchange interaction
  • torque measurement

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