• Journal of Semiconductors
  • Vol. 40, Issue 8, 081509 (2019)
Zhai Baoxing1, Du Juan2, Li Xueping3, Xia Congxin1, and Wei Zhongming4
Author Affiliations
  • 1Department of Physics, Henan Normal University, Xinxiang 453007, China
  • 2State Key Laboratory for Artificial Microstructures and Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China
  • 3College of Electronic and Electrical Engineering, Henan Normal University, Xinxiang 453007, China
  • 4Institutes of Semiconductors, Chinese Academy of Sciences, Beijing 100083, China
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    Abstract

    Since the successful fabrication of two-dimensional (2D) ferromagnetic (FM) monolayer CrI3 and Cr2Ge2Te6, 2D FM materials are becoming an exciting research topic in condensed matter physics and materials fields, as they provide a good platform to explore the fundamental physical properties of magnetic materials under 2D limit. In this review, we summarize the theoretical research progress of intrinsic 2D FM materials and related van der Waals heterostructures (vdWHs) including their electronic structures, magnetism, Curie temperature, valley polarization, and band alignment. Moreover, we also summarize recent researches on the methods that used to regulate the above properties of 2D FM materials and vdWHs, such as defects, doping, strain, electric field and interlayer coupling. These studies show that 2D FM materials have broad application prospects in spintronics and valleytronics. However, there are still many problems waiting to be solved on the way to practical application.

    1. Introduction

    Because of the prediction of Landau, people are always uncertain of the existence of two-dimensional (2D) materials before graphene was exfoliated successfully[1]. Also for 2D ferromagnetic (FM) materials, the famous Mermin-Wagner theorem points out: Long-range magnetic order of isotropic spin-S Heisenberg model does not exist at nonzero temperature in dimensions d ≤ 2[2], which discourages many people who want to study 2D ferromagnets. However, people have not completely given up looking for 2D ferromagnets. After unremitting research, it has been found that magnetism can be indued in 2D systems by some external conditions, such as doping[35] and defects[6, 7]. Until 2017, 2D FM monolayer CrI3[8] and Cr2Ge2Te6[9] were successfully fabricated in experiments, which has attracted extensive attention. Massive researches on monolayer CrI3 and Cr2Ge2Te6 are beginning to emerge[1017]. People have regained confidence and enthusiasm for the study of 2D ferromagnet. Recently, new 2D FM materials have been constantly predicted theoretically and synthesized experimentally, such as Fe3GeTe2[18], VSe2[19], MnSe2[20], Fe3P[21], VI3[22], and so on. The appearance of 2D FM materials provides a good platform for people to study physical properties of magnetic materials under 2D limit.

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    Baoxing Zhai, Juan Du, Xueping Li, Congxin Xia, Zhongming Wei. Two-dimensional ferromagnetic materials and related van der Waals heterostructures: a first-principle study[J]. Journal of Semiconductors, 2019, 40(8): 081509
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    Category: Reviews
    Received: Jun. 2, 2019
    Accepted: --
    Published Online: Sep. 18, 2021
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