Low-field magnetic anisotropy of Sr2IrO4. (20th January 2022)

• Record Type: Journal Article
• Authors: Nauman, Muhammad; Hussain, Tayyaba; Choi, Joonyoung; Lee, Nara; Choi, Young Jai; Kang, Woun; Jo, Younjung
• Is Part Of: Journal of physics. Volume 34:Number 13(2022)
• Publication Date: 2022-01-20
• Subjects: Sr2IrO4 -- torque measurement -- magnetic anisotropy -- spin–orbit-coupled magnetic exchange interaction; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/ac484d
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: Magnetic anisotropy in strontium iridate (Sr2 IrO4 ) 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 Sr2 IrO4 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 Sr2 IrO4 for future studies.