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

doi:10.1088/1674-1056/ad5af1

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.

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

Received: 06 May 2024
Revised: 20 June 2024
Accepted manuscript online: 24 June 2024

PACS:	72.10.-d	(Theory of electronic transport; scattering mechanisms)
	75.50.-y	(Studies of specific magnetic materials)
	81.05.-t	(Specific materials: fabrication, treatment, testing, and analysis)
	85.70.-w	(Magnetic devices)

Fund: 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).

Corresponding Authors: Liang He
E-mail: heliang@nju.edu.cn

Cite this article:

Jin Wang(王瑾), Yu Liu(刘宇), Taikun Wang(王太坤), Yongkang Xu(徐永康), Shuanghai Wang(王双海), Kun He(何坤), Yafeng Deng(邓亚峰), Pengfei Yan(闫鹏飞), and Liang He(何亮) Current-perpendicular-to-plane transport properties of 2D ferromagnetic material CrTe₂ 2024 Chin. Phys. B 33 097201

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

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