Ultrathin ferrite nanosheets for room-temperature two-dimensional magnetic semiconductors

Ruiqing Cheng, Lei Yin, Yao Wen, Baoxing Zhai, Yuzheng Guo, Zhaofu Zhang, Weitu Liao, Wenqi Xiong, Hao Wang, Shengjun Yuan, Jian Jiang, Chuansheng Liu and Jun He ()
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Ruiqing Cheng: Wuhan University
Lei Yin: Wuhan University
Yao Wen: Wuhan University
Baoxing Zhai: Wuhan University
Yuzheng Guo: Wuhan University
Zhaofu Zhang: Wuhan University
Weitu Liao: Wuhan University
Wenqi Xiong: Wuhan University
Hao Wang: Wuhan University
Shengjun Yuan: Wuhan University
Jian Jiang: Wuhan University
Chuansheng Liu: Wuhan University
Jun He: Wuhan University

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract The discovery of magnetism in ultrathin crystals opens up opportunities to explore new physics and to develop next-generation spintronic devices. Nevertheless, two-dimensional magnetic semiconductors with Curie temperatures higher than room temperature have rarely been reported. Ferrites with strongly correlated d-orbital electrons may be alternative candidates offering two-dimensional high-temperature magnetic ordering. This prospect is, however, hindered by their inherent three-dimensional bonded nature. Here, we develop a confined-van der Waals epitaxial approach to synthesizing air-stable semiconducting cobalt ferrite nanosheets with thickness down to one unit cell using a facile chemical vapor deposition process. The hard magnetic behavior and magnetic domain evolution are demonstrated by means of vibrating sample magnetometry, magnetic force microscopy and magneto-optical Kerr effect measurements, which shows high Curie temperature above 390 K and strong dimensionality effect. The addition of room-temperature magnetic semiconductors to two-dimensional material family provides possibilities for numerous novel applications in computing, sensing and information storage.

Date: 2022
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DOI: 10.1038/s41467-022-33017-1

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