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Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS4

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Title
Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS4
Author(s)
Son, Joolee; Suhan Son; Pyeongjae Park; Kim, Maengsuk; Tao, Zui; Oh, Juhyun; Lee, Taehyeon; Lee, Sanghyun; Junghyun Kim; Kaixuan Zhang; Cho, Kwanghee; Kamiyama, Takashi; Lee, Jun Hee; Mak, Kin Fai; Shan, Jie; Kim, Miyoung; Je-Geun Park; Lee, Jieun
Publication Date
2021-10-26
Journal
ACS Nano, v.15, no.10, pp.16904 - 16912
Publisher
American Chemical Society
Abstract
© 2021 American Chemical Society.Ferromagnetism in two-dimensional materials presents a promising platform for the development of ultrathin spintronic devices with advanced functionalities. Recently discovered ferromagnetic van der Waals crystals such as CrI3, readily isolated two-dimensional crystals, are highly tunable through external fields or structural modifications. However, there remains a challenge because of material instability under air exposure. Here, we report the observation of an air-stable and layer-dependent ferromagnetic (FM) van der Waals crystal, CrPS4, using magneto-optic Kerr effect microscopy. In contrast to the antiferromagnetic (AFM) bulk, the FM out-of-plane spin orientation is found in the monolayer crystal. Furthermore, alternating AFM and FM properties observed in even and odd layers suggest robust antiferromagnetic exchange interactions between layers. The observed ferromagnetism in these crystals remains resilient even after the air exposure of about a day, providing possibilities for the practical applications of van der Waals spintronics.
URI
https://pr.ibs.re.kr/handle/8788114/10871
DOI
10.1021/acsnano.1c07860
ISSN
1936-0851
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > 1. Journal Papers (저널논문)
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