Large magnetic anisotropy in canted antiferromagnetic Sr2IrO4 single crystals

Yunjeong Hong, Younjung Jo, Hwan Young Choi, Nara Lee, Young Jai Choi, Woun Kang

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The magnetocrystalline contribution to magnetic anisotropy was studied in the canted antiferromagnetic state of layered Sr2IrO4 single crystals. We performed torque measurements in magnetic fields up to 9 T under various magnetic field orientations. The strong dependence of torque on the magnetic field revealed that the magnetic easy axis is along the in-plane direction and that the observed field-induced weak ferromagnetic order is attributed only to the in-plane component of the external magnetic field. The dependence of torque on the angle produces a twofold symmetric sawtoothlike shape. A simple model consisting of canted antiferromagnetic and magnetic induction terms showed good agreement with the measured torque. These results show that magnetic anisotropy is closely related to the anisotropy of the exchange between antiferromagnetic moments whose canting is mediated by the Dzyaloshinsky-Moriya interaction. Our study demonstrates that torque magnetometry can be extended to the investigation of the magnetic anisotropy of complex magnetic phases.

Original languageEnglish
Article number094406
JournalPhysical Review B
Volume93
Issue number9
DOIs
Publication statusPublished - 2016 Mar 7

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Magnetic anisotropy
torque
Torque
Single crystals
Magnetic fields
anisotropy
single crystals
magnetic fields
Torque measurement
Electromagnetic induction
magnetic induction
Anisotropy
magnetic measurement
induction
moments
interactions

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Hong, Yunjeong ; Jo, Younjung ; Choi, Hwan Young ; Lee, Nara ; Choi, Young Jai ; Kang, Woun. / Large magnetic anisotropy in canted antiferromagnetic Sr2IrO4 single crystals. In: Physical Review B. 2016 ; Vol. 93, No. 9.
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Large magnetic anisotropy in canted antiferromagnetic Sr2IrO4 single crystals. / Hong, Yunjeong; Jo, Younjung; Choi, Hwan Young; Lee, Nara; Choi, Young Jai; Kang, Woun.

In: Physical Review B, Vol. 93, No. 9, 094406, 07.03.2016.

Research output: Contribution to journalArticle

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AB - The magnetocrystalline contribution to magnetic anisotropy was studied in the canted antiferromagnetic state of layered Sr2IrO4 single crystals. We performed torque measurements in magnetic fields up to 9 T under various magnetic field orientations. The strong dependence of torque on the magnetic field revealed that the magnetic easy axis is along the in-plane direction and that the observed field-induced weak ferromagnetic order is attributed only to the in-plane component of the external magnetic field. The dependence of torque on the angle produces a twofold symmetric sawtoothlike shape. A simple model consisting of canted antiferromagnetic and magnetic induction terms showed good agreement with the measured torque. These results show that magnetic anisotropy is closely related to the anisotropy of the exchange between antiferromagnetic moments whose canting is mediated by the Dzyaloshinsky-Moriya interaction. Our study demonstrates that torque magnetometry can be extended to the investigation of the magnetic anisotropy of complex magnetic phases.

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