Direct Photoluminescence Probing of Ferromagnetism in Monolayer Two-Dimensional CrBr3

Atomically thin magnets are the key element to build up spintronics based on two-dimensional materials. The surface nature of two-dimensional ferromagnet opens up opportunities to improve the device performance efficiently. Here, we report the intrinsic ferromagnetism in atomically thin monolayer Cr...

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Published inNano letters Vol. 19; no. 5; pp. 3138 - 3142
Main Authors Zhang, Zhaowei, Shang, Jingzhi, Jiang, Chongyun, Rasmita, Abdullah, Gao, Weibo, Yu, Ting
Format Journal Article
LanguageEnglish
Published American Chemical Society 08.05.2019
Subjects
CrBr3
van der Waals
magnetic field
Ferromagnetism
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Summary:Atomically thin magnets are the key element to build up spintronics based on two-dimensional materials. The surface nature of two-dimensional ferromagnet opens up opportunities to improve the device performance efficiently. Here, we report the intrinsic ferromagnetism in atomically thin monolayer CrBr3, directly probed by polarization resolved magneto-photoluminescence. The spontaneous magnetization persists in monolayer CrBr3 with a Curie temperature of 34 K. The development of magnons by the thermal excitation is in line with the spin-wave theory. We attribute the layer-number-dependent hysteresis loops in thick layers to the magnetic domain structures. As a stable monolayer material in air, CrBr3 provides a convenient platform for fundamental physics and pushes the potential applications of the two-dimensional ferromagnetism.
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ISSN:1530-6984
1530-6992
1530-6992
DOI:10.1021/acs.nanolett.9b00553