Spin-transfer torques for domain wall motion in antiferromagnetically coupled ferrimagnets
- Authors
- Okuno, Takaya; Kim, Duck-Ho; Oh, Se-Hyeok; Kim, Se Kwon; Hirata, Yuushou; Nishimura, Tomoe; Ham, Woo Seung; Futakawa, Yasuhiro; Yoshikawa, Hiroki; Tsukamoto, Arata; Tserkovnyak, Yaroslav; Shiota, Yoichi; Moriyama, Takahiro; Kim, Kab-Jin; Lee, Kyung-Jin; Ono, Teruo
- Issue Date
- 9월-2019
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE ELECTRONICS, v.2, no.9, pp.389 - 393
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE ELECTRONICS
- Volume
- 2
- Number
- 9
- Start Page
- 389
- End Page
- 393
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/63054
- DOI
- 10.1038/s41928-019-0303-5
- ISSN
- 2520-1131
- Abstract
- Antiferromagnetic materials offer ultrafast spin dynamics and could be used to build devices that are orders of magnitude faster than those based on ferromagnetic materials. Spin-transfer torque is key to the electrical control of spins and has been demonstrated in ferromagnetic spintronics. However, experimental exploration of spin-transfer torque in antiferromagnets remains limited, despite a number of theoretical studies. Here, we report an experimental examination of the effects of spintransfer torque on the motion of domain walls in antiferromagnetically coupled ferrimagnets. Using a ferrimagnetic gadolinium-iron-cobalt (GdFeCo) alloy in which Gd and FeCo moments are coupled antiferromagnetically, we find that non-adiabatic spin-transfer torque acts like a staggered magnetic field, providing efficient control of the domain walls. We also show that the non-adiabaticity parameter of the spin-transfer torque is significantly larger than the Gilbert damping parameter, in contrast to the case of non-adiabatic spin-transfer torque in ferromagnets.
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Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
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