Controlling the magnetic properties of layered Cr2Te3 thin films via ex-situ annealingopen access
- Authors
- Lee, In Hak; Khim, Yeong Gwang; Eom, Jaeun; Kee, Jung Yun; Choi, Byoung Ki; Kim, Hyuk Jin; Kim, Ryung; Jung, Min Young; Lee, Kyeong Jun; Kim, Younghak; Noh, Woo-Suk; Lee, Byeong-hyeon; Suh, Hoyoung; Chang, Hye Jung; Won, Sung Ok; Jang, Chaun; Ryu, Hyejin; Lee, Dong Ryeol; Chang, Seo Hyoung; Lee, Hyun Hwi; Chang, Young Jun; Choi, Jun Woo
- Issue Date
- Mar-2024
- Publisher
- ELSEVIER
- Keywords
- van der Waals magnetic materials; Cr2Te3 thin films; Ex-situ annealing; Curie temperature; Lattice expansion
- Citation
- APPLIED SURFACE SCIENCE, v.648
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 648
- URI
- https://scholarworks.bwise.kr/ssu/handle/2018.sw.ssu/49127
- DOI
- 10.1016/j.apsusc.2023.159057
- ISSN
- 0169-4332
1873-5584
- Abstract
- We present a post-growth ex-situ annealing method to control the Curie temperature and magnetic anisotropy of Cr2Te3 van der Waals ferromagnetic thin films. The as-grown Cr2Te3 films exhibit a Curie temperature -170 K with an out-of-plane magnetic easy axis. Upon high temperature (300 - 400 degrees C) ex-situ annealing, the magnetic phase of the film changes: the Curie temperature is significantly increased to -300 K and the magnetic easy axis is reoriented to the in-plane direction. Electronic, chemical, and structural analyses suggest that the c-axis lattice constant expansion, accompanying the annealing process, is the origin of the ex-situ-annealing-induced modu-lation of the Cr2Te3 film magnetic properties. These results demonstrate that a practical ex-situ annealing process can be effectively used to control the magnetic properties of van der Waals ferromagnetic thin films. Further-more, the room temperature ferromagnetic ordering emerging upon annealing, along with its robustness against post-growth thermal processes, suggests that the Cr2Te3 thin film is a promising magnetic material candidate for potential application in van-der-Waals-material-based spintronic devices.
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