中国物理B ›› 2024, Vol. 33 ›› Issue (9): 97201-097201.doi: 10.1088/1674-1056/ad5af1

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Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2

Jin Wang(王瑾)1,2, Yu Liu(刘宇)1,2, Taikun Wang(王太坤)1,2, Yongkang Xu(徐永康)1,2, Shuanghai Wang(王双海)1,2, Kun He(何坤)1,2, Yafeng Deng(邓亚峰)1,2, Pengfei Yan(闫鹏飞)1,2, and Liang He(何亮)1,2,†   

  1. 1 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
    2 State Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
  • 收稿日期:2024-05-06 修回日期:2024-06-20 接受日期:2024-06-24 发布日期:2024-08-15
  • 通讯作者: Liang He E-mail:heliang@nju.edu.cn
  • 基金资助:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 12241403 and 61974061) and the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20140054).

Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe2

Jin Wang(王瑾)1,2, Yu Liu(刘宇)1,2, Taikun Wang(王太坤)1,2, Yongkang Xu(徐永康)1,2, Shuanghai Wang(王双海)1,2, Kun He(何坤)1,2, Yafeng Deng(邓亚峰)1,2, Pengfei Yan(闫鹏飞)1,2, and Liang He(何亮)1,2,†   

  1. 1 School of Electronic Science and Engineering, Nanjing University, Nanjing 210023, China;
    2 State Key Laboratory of Spintronics, Nanjing University, Suzhou 215163, China
  • Received:2024-05-06 Revised:2024-06-20 Accepted:2024-06-24 Published:2024-08-15
  • Contact: Liang He E-mail:heliang@nju.edu.cn
  • Supported by:
    This work was supported by the National Natural Science Foundation of China (Grant Nos. 12241403 and 61974061) and the Natural Science Foundation of Jiangsu Province of China (Grant No. BK20140054).

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摘要： Heterostructures of van der Waals (vdW) ferromagnetic materials have become a focal point in research of low-dimensional spintronic devices. The current direction in spin valves is commonly perpendicular to the plane (CPP). However, the transport properties of the CPP mode remain largely unexplored. In this work, current-in-plane (CIP) mode and CPP mode for CrTe$_{2}$ thin films are carefully studied. The temperature-dependent longitudinal resistance transitions from metallic (CIP) to semiconductor behavior (CPP), with the electrical resistivity of CPP increased by five orders of magnitude. More importantly, the transport properties of the CPP can be categorized into a single-gap tunneling-through model with the activation energy ($E_{\rm a}$) of $\sim$ 1.34 meV/gap at 300-150 K, the variable range hopping model with a linear negative magnetoresistance at 150-20 K, and weak localization region with a nonlinear magnetic resistance below 20 K. This study explores the vertical transport in CrTe$_{2}$ materials for the first time, contributing to understand its unique properties and to pave the way for its potential in spin valve devices.

关键词: 2D vdW, CrTe$_{2}$, current-perpendicular-to-plane, negative magnetic resistance

Abstract: Heterostructures of van der Waals (vdW) ferromagnetic materials have become a focal point in research of low-dimensional spintronic devices. The current direction in spin valves is commonly perpendicular to the plane (CPP). However, the transport properties of the CPP mode remain largely unexplored. In this work, current-in-plane (CIP) mode and CPP mode for CrTe$_{2}$ thin films are carefully studied. The temperature-dependent longitudinal resistance transitions from metallic (CIP) to semiconductor behavior (CPP), with the electrical resistivity of CPP increased by five orders of magnitude. More importantly, the transport properties of the CPP can be categorized into a single-gap tunneling-through model with the activation energy ($E_{\rm a}$) of $\sim$ 1.34 meV/gap at 300-150 K, the variable range hopping model with a linear negative magnetoresistance at 150-20 K, and weak localization region with a nonlinear magnetic resistance below 20 K. This study explores the vertical transport in CrTe$_{2}$ materials for the first time, contributing to understand its unique properties and to pave the way for its potential in spin valve devices.

Key words: 2D vdW, CrTe$_{2}$, current-perpendicular-to-plane, negative magnetic resistance

中图分类号:  (Theory of electronic transport; scattering mechanisms)

  • 72.10.-d
75.50.-y (Studies of specific magnetic materials) 81.05.-t (Specific materials: fabrication, treatment, testing, and analysis) 85.70.-w (Magnetic devices)