Antiferromagnet-Based Spintronic Functionality by Controlling Isospin Domains in a Layered Perovskite Iridate

Nara Lee, Eunjung Ko, Hwan Young Choi, Yun Jeong Hong, Muhammad Nauman, Woun Kang, Hyoung Joon Choi, Young Jai Choi, Younjung Jo

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The novel electronic state of the canted antiferromagnetic (AFM) insulator strontium iridate (Sr2IrO4) is well described by the spin–orbit-entangled isospin Jeff = 1/2, but the role of isospin in transport phenomena remains poorly understood. In this study, antiferromagnet-based spintronic functionality is demonstrated by combining the unique characteristics of the isospin state in Sr2IrO4. Based on magnetic and transport measurements, a large and highly anisotropic magnetoresistance (AMR) is obtained by manipulating the AFM isospin domains. First-principles calculations suggest that electrons whose isospin directions are strongly coupled to the in-plane net magnetic moment encounter an isospin mismatch when moving across the AFM domain boundaries, which generates a high resistance state. By rotating a magnetic field that aligns in-plane net moments and removes domain boundaries, the macroscopically ordered isospins govern dynamic transport through the system, which leads to the extremely angle-sensitive AMR. As this work establishes a link between isospins and magnetotransport in strongly spin–orbit-coupled AFM Sr2IrO4, the peculiar AMR effect provides a beneficial foundation for fundamental and applied research on AFM spintronics.

Original languageEnglish
Article number1805564
JournalAdvanced Materials
Volume30
Issue number52
DOIs
Publication statusPublished - 2018 Dec 27

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Enhanced magnetoresistance
Magnetoelectronics
Perovskite
Galvanomagnetic effects
Strontium
Electronic states
Magnetic moments
Magnetic fields
Electrons
perovskite

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Lee, Nara ; Ko, Eunjung ; Choi, Hwan Young ; Hong, Yun Jeong ; Nauman, Muhammad ; Kang, Woun ; Choi, Hyoung Joon ; Choi, Young Jai ; Jo, Younjung. / Antiferromagnet-Based Spintronic Functionality by Controlling Isospin Domains in a Layered Perovskite Iridate. In: Advanced Materials. 2018 ; Vol. 30, No. 52.
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abstract = "The novel electronic state of the canted antiferromagnetic (AFM) insulator strontium iridate (Sr2IrO4) is well described by the spin–orbit-entangled isospin Jeff = 1/2, but the role of isospin in transport phenomena remains poorly understood. In this study, antiferromagnet-based spintronic functionality is demonstrated by combining the unique characteristics of the isospin state in Sr2IrO4. Based on magnetic and transport measurements, a large and highly anisotropic magnetoresistance (AMR) is obtained by manipulating the AFM isospin domains. First-principles calculations suggest that electrons whose isospin directions are strongly coupled to the in-plane net magnetic moment encounter an isospin mismatch when moving across the AFM domain boundaries, which generates a high resistance state. By rotating a magnetic field that aligns in-plane net moments and removes domain boundaries, the macroscopically ordered isospins govern dynamic transport through the system, which leads to the extremely angle-sensitive AMR. As this work establishes a link between isospins and magnetotransport in strongly spin–orbit-coupled AFM Sr2IrO4, the peculiar AMR effect provides a beneficial foundation for fundamental and applied research on AFM spintronics.",
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Antiferromagnet-Based Spintronic Functionality by Controlling Isospin Domains in a Layered Perovskite Iridate. / Lee, Nara; Ko, Eunjung; Choi, Hwan Young; Hong, Yun Jeong; Nauman, Muhammad; Kang, Woun; Choi, Hyoung Joon; Choi, Young Jai; Jo, Younjung.

In: Advanced Materials, Vol. 30, No. 52, 1805564, 27.12.2018.

Research output: Contribution to journalArticle

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AU - Nauman, Muhammad

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AU - Jo, Younjung

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