Long spin coherence length and bulk-like spin-orbit torque in ferrimagnetic multilayers
- Authors
- Yu, Jiawei; Bang, Do; Mishra, Rahul; Ramaswamy, Rajagopalan; Oh, Jung Hyun; Park, Hyeon-Jong; Jeong, Yunboo; Pham Van Thach; Lee, Dong-Kyu; Go, Gyungchoon; Lee, Seo-Won; Wang, Yi; Shi, Shuyuan; Qiu, Xuepeng; Awano, Hiroyuki; Lee, Kyung-Jin; Yang, Hyunsoo
- Issue Date
- 1월-2019
- Publisher
- NATURE PUBLISHING GROUP
- Citation
- NATURE MATERIALS, v.18, no.1, pp.29 - +
- Indexed
- SCIE
SCOPUS
- Journal Title
- NATURE MATERIALS
- Volume
- 18
- Number
- 1
- Start Page
- 29
- End Page
- +
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/68383
- DOI
- 10.1038/s41563-018-0236-9
- ISSN
- 1476-1122
- Abstract
- Spintronics relies on magnetization switching through current-induced spin torques. However, because spin transfer torque for ferromagnets is a surface torque, a large switching current is required for a thick, thermally stable ferromagnetic cell, and this remains a fundamental obstacle for high-density non-volatile applications with ferromagnets. Here, we report a long spin coherence length and associated bulk-like torque characteristics in an antiferromagnetically coupled ferrimagnetic multilayer. We find that a transverse spin current can pass through >10-nm-thick ferrimagnetic Co/Tb multilayers, whereas it is entirely absorbed by a 1-nm-thick ferromagnetic Co/Ni multilayer. We also find that the switching efficiency of Co/Tb multilayers partially reflects a bulk-like torque characteristic, as it increases with ferrimagnet thickness up to 8 nm and then decreases, in clear contrast to the 1/thickness dependence of ferromagnetic Co/Ni multilayers. Our results on antiferromagnetically coupled systems will invigorate research towards the development of energy-efficient spintronics.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Materials Science and Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.