Fabrication and magnetic–electronic properties of van der Waals Cr4Te5 ferromagnetic films

Weiyuan Wang; Jiyu Fan; Hao Liu; Huan Zheng; Chunlan Ma; Lei Zhang; Yunbin Sun; Caixia Wang; Yan Zhu; Hao Yang

doi:10.1039/D1CE01200B

Fabrication and magnetic–electronic properties of van der Waals Cr₄Te₅ ferromagnetic films

Weiyuan Wang,^ab Jiyu Fan,

*^ab Hao Liu,^a Huan Zheng,^a Chunlan Ma,^c Lei Zhang,

^d Yunbin Sun,^e Caixia Wang,^f Yan Zhu^ab and Hao Yang^ab

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* Corresponding authors

^a Department of Applied Physics, College of Physics Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
E-mail: jiyufan@nuaa.edu.cn, yanghao@nuaa.edu.cn

^b Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing 211106, China

^c Jiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou, China

^d High Magnetic Field Laboratory, Chinese Academy of Sciences, Hefei 230031, China

^e Department of Physics Science and Technology, Baotou Normal College, Baotou 014030, China

^f College of Physics Science and Technology, Yangzhou University, Yangzhou 225002, China

Abstract

Exploiting two-dimensional van der Waals (2D vdW) room temperature ferromagnetic materials is always significant and valuable work. However, the actual number of satisfactory materials with intrinsic ferromagnetism is very limited. Here, the 2D layered Cr₄Te₅ epitaxial films prepared by a pulsed laser deposition technique were confirmed to hold a ferromagnetic ordering state up to 300 K. We find that the Cr₄Te₅ films can easily achieve epitaxial growth along a single orientation of the hexagonal Al₂O₃(0001) substrate. However, as for the cubic SrTiO₃(001) and multiphase structure mica substrates, the Cr₄Te₅ films only show uniaxial growth instead of epitaxial growth. Based on the investigation of electronic transport in the metallic regime, it is revealed that the interaction of electron–magnon scattering only exists in the lower temperature region. Our work renders 2D vdW Cr₄Te₅ crystals a very promising material for developing practical spintronic nanodevices.

CrystEngComm

Fabrication and magnetic–electronic properties of van der Waals Cr₄Te₅ ferromagnetic films

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Fabrication and magnetic–electronic properties of van der Waals Cr₄Te₅ ferromagnetic films

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