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

Joolee Son; Suhan Son; Pyeongjae Park; Maengsuk Kim; Zui Tao; Juhyun Oh; Taehyeon Lee; Sanghyun Lee; Junghyun Kim; Kaixuan Zhang; Kwanghee Cho; Takashi Kamiyama; Jun Hee Lee; Kin Fai Mak; Jie Shan; Miyoung Kim; Je Geun Park; Jieun Lee

doi:10.1021/acsnano.1c07860

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

Joolee Son, Suhan Son, Pyeongjae Park, Maengsuk Kim, Zui Tao, Juhyun Oh, Taehyeon Lee, Sanghyun Lee, Junghyun Kim, Kaixuan Zhang, Kwanghee Cho, Takashi Kamiyama, Jun Hee Lee, Kin Fai Mak, Jie Shan, Miyoung Kim, Je Geun Park, Jieun Lee

Research output: Contribution to journal › Article › peer-review

52 Scopus citations

Abstract

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.

Original language	English
Pages (from-to)	16904-16912
Number of pages	9
Journal	ACS Nano
Volume	15
Issue number	10
DOIs	https://doi.org/10.1021/acsnano.1c07860
State	Published - Oct 26 2021
Externally published	Yes

Funding

This work was supported by the New Faculty Startup Fund from Seoul National University. J.S., T.L. and J.L were supported by the National Research Foundation (NRF) of Korea (Grant Nos. 2017R1C1B2002631, 2020R1A2C2011334, 2020R1A5A6052558, and 2021R1A5A1032996). Work at IBS CCES was supported by the Institute for Basic Science (IBS), Korea (Grant No. IBS-R009-G1). Work at CQM was supported by the Leading Researcher Program of the NRF, Korea (Grant No. 2020R1A3B2079375). Theoretical analysis of Maengsuk Kim and J.H.L. were supported by Creative Materials Discovery of the NRF, Korea (Grant No. 2017M3D1A1040828). J.O. and Miyoung Kim were supported by the National Research Foundation (NRF) of Korea (Grant No. 2017R1A2B3011629). Work at Cornell University was supported by the US National Science Foundation (NSF) under DMR-1807810. The SuperHRPD experiment was performed at the Materials and Life Science Experimental Facility of the J-PARC, Japan (Proposal No. 2019BF0802). J.L. acknowledges support from the TJ Park Science Fellowship of POSCO TJ Park Foundation, Korea.

Funders	Funder number
National Science Foundation	DMR-1807810
POSCO TJ Park Foundation
Seoul National University
National Research Foundation of Korea	2017R1C1B2002631, 2020R1A2C2011334, 2020R1A5A6052558, 2021R1A5A1032996
Institute for Basic Science	2020R1A3B2079375, 2017M3D1A1040828, 2017R1A2B3011629, IBS-R009-G1

Keywords

CrPS
air stability
ferromagnetism
magneto-optic Kerr effect
van der Waals material

Access to Document

10.1021/acsnano.1c07860

Cite this

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title = "Air-Stable and Layer-Dependent Ferromagnetism in Atomically Thin van der Waals CrPS4",

abstract = "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.",

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AU - Tao, Zui

AU - Oh, Juhyun

AU - Lee, Taehyeon

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AU - Kim, Junghyun

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AU - Cho, Kwanghee

AU - Kamiyama, Takashi

AU - Lee, Jun Hee

AU - Mak, Kin Fai

AU - Shan, Jie

AU - Kim, Miyoung

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AU - Lee, Jieun

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