Sign-tunable anisotropic magnetoresistance and electrically detectable dual magnetic phases in a helical antiferromagnet
- Authors
- 김종혁; 신현준; 김미경; 홍재민; 정기원; 김진석; Kyungsun Moon; Nara Lee; Young Jai Choi
- Issue Date
- Aug-2022
- Publisher
- NATURE PUBLISHING GROUP
- Keywords
- Helical antiferromagnet; Antiferromagnetic spintronics; helix-to-fan transition; Anisotropic magnetoresistance
- Citation
- NPG ASIA MATERIALS, v.14, no.1, pp 67-1 - 67-8
- Journal Title
- NPG ASIA MATERIALS
- Volume
- 14
- Number
- 1
- Start Page
- 67-1
- End Page
- 67-8
- URI
- https://yscholarhub.yonsei.ac.kr/handle/2021.sw.yonsei/6463
- DOI
- 10.1038/s41427-022-00415-2
- ISSN
- 1884-4049
- Abstract
- Emerging from competing exchange interactions, the helimagnetic order describes a noncollinear spin texture of antiferromagnets. Although collinear antiferromagnets act as the elemental building blocks of antiferromagnetic (AFM) spintronics, the potential of implementing spintronic functionality in noncollinear antiferromagnets has not been clarified thus far. Here, we propose an AFM helimagnet of EuCo2As2 as a novel single-phase spintronic material that exhibits a remarkable sign reversal of anisotropic magnetoresistance (AMR). The contrast in the AMR arises from two electrically distinctive magnetic phases with spin reorientation that is driven by the magnetic field prevailing in the easy-plane, which converts the AMR from positive to negative. Furthermore, based on an easy-plane anisotropic spin model, we theoretically identified various AFM memory states associated with the evolution of the spin structure under magnetic fields. The results revealed the potential of noncollinear antiferromagnets for the development of spintronic devices.
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Collections - College of Science > Physics > 1. Journal Articles
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