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Nano Research 2022, 15(8): 7597-7603 https://doi.org/10.1007/s12274-022-4400-9
Research Article | Issue | Published: 10 May 2022

Thickness-dependent and strain-tunable magnetism in two-dimensional van der Waals VSe2

Show Author's Information Wenjuan Ci1,§,  Huali Yang2,§,  Wuhong Xue1( ),  Ruilong Yang1,  Baohua Lv1,  Peng Wang1,  Run-Wei Li2,  Xiao-Hong Xu1( )
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science, Shanxi Normal University, Taiyuan 030031, China
CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

§ Wenjuan Ci and Huali Yang contributed equally to this work.

Keywords:
room-temperature ferromagnetism, thickness-dependent magnetism, strain-modulated magnetism, two-dimensional (2D) vanadium diselenide (VSe2)
Topics:
Magnetic materials
Cite this article:
Ci W, Yang H, Xue W, et al. Thickness-dependent and strain-tunable magnetism in two-dimensional van der Waals VSe2. Nano Research, 2022, 15(8): 7597-7603. https://doi.org/10.1007/s12274-022-4400-9
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Abstract Full text Electronic supplementary material About this article

Two-dimensional (2D) van der Waals (vdW) magnetic materials with reduced dimensionality often exhibit unexpected properties compared to their bulk counterparts. In particular, the mechanical flexibility of 2D structure, enhanced ferromagnetism at reduced layer thickness, as well as robust perpendicular magnetic anisotropy are quite appealing for constructing novel spintronic devices. The vdW vanadium diselenide (VSe2) is an attractive material whose bulk is paramagnetic while monolayer is ferromagnetic with a Curie temperature (Tc) above room temperature. To explore its possible device applications, a detailed investigation on the thickness-dependent magnetism and strain modulation behavior of VSe2 is highly demanded. In this article, the VSe2 nanoflakes were controllably prepared via chemical vapor deposition (CVD) method. The few-layer single VSe2 nanoflakes were found to exhibit magnetic domain structures at room temperature. Ambient magnetic force microscopy (MFM) phase images reveal a clear thickness-dependent magnetism and the MFM phase contrast is traceable for the nanoflakes of layer thickness below ~ 6 nm. Moreover, applying strain is found efficient in modulating the magnetic moment and coercive field of 2D VSe2 at room temperature. These results are helpful for understanding the ferromagnetism of high temperature 2D magnets and for constructing novel straintronic devices or flexible spintronic devices.


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About this article

Thickness-dependent and strain-tunable magnetism in two-dimensional van der Waals VSe2

Show Author's information Wenjuan Ci1,§, Huali Yang2,§, Wuhong Xue1( ), Ruilong Yang1, Baohua Lv1, Peng Wang1, Run-Wei Li2, Xiao-Hong Xu1( )
Key Laboratory of Magnetic Molecules and Magnetic Information Materials of Ministry of Education, School of Chemistry and Materials Science, Shanxi Normal University, Taiyuan 030031, China
CAS Key Laboratory of Magnetic Materials and Devices & Zhejiang Province Key Laboratory of Magnetic Materials and Application Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China

§ Wenjuan Ci and Huali Yang contributed equally to this work.

Abstract

Two-dimensional (2D) van der Waals (vdW) magnetic materials with reduced dimensionality often exhibit unexpected properties compared to their bulk counterparts. In particular, the mechanical flexibility of 2D structure, enhanced ferromagnetism at reduced layer thickness, as well as robust perpendicular magnetic anisotropy are quite appealing for constructing novel spintronic devices. The vdW vanadium diselenide (VSe2) is an attractive material whose bulk is paramagnetic while monolayer is ferromagnetic with a Curie temperature (Tc) above room temperature. To explore its possible device applications, a detailed investigation on the thickness-dependent magnetism and strain modulation behavior of VSe2 is highly demanded. In this article, the VSe2 nanoflakes were controllably prepared via chemical vapor deposition (CVD) method. The few-layer single VSe2 nanoflakes were found to exhibit magnetic domain structures at room temperature. Ambient magnetic force microscopy (MFM) phase images reveal a clear thickness-dependent magnetism and the MFM phase contrast is traceable for the nanoflakes of layer thickness below ~ 6 nm. Moreover, applying strain is found efficient in modulating the magnetic moment and coercive field of 2D VSe2 at room temperature. These results are helpful for understanding the ferromagnetism of high temperature 2D magnets and for constructing novel straintronic devices or flexible spintronic devices.

Keywords: room-temperature ferromagnetism, thickness-dependent magnetism, strain-modulated magnetism, two-dimensional (2D) vanadium diselenide (VSe2)

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Acknowledgements

Publication history

Received: 17 February 2022
Revised: 01 April 2022
Accepted: 06 April 2022
Published: 10 May 2022
Issue date: August 2022

Copyright

© Tsinghua University Press 2022

Acknowledgements

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 61904099, 51871137, 12174237 and 52002232). H. L. Y. is supported by Key Laboratory of Magnetic Molecules & Magnetic Information Materials Ministry of Education, Shanxi Normal University (No. MMMM-202004).

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