Tunable Room-Temperature Ferromagnetism in Two-Dimensional Cr2Te3
Tunable Room-Temperature Ferromagnetism in Two-Dimensional Cr2Te3
复制标题
二维 Cr2Te3 中的可调谐室温铁磁性
DOI：
10.1021/acs.nanolett.9b05128
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发表时间：
2020
期刊：
影响因子：
10.8
通讯作者：
Jun He
中科院分区：
文献类型：
--
作者：
Yao Wen;Zhehong Liu;Yu Zhang;Congxin Xia;Baoxing Zhai;Xinhui Zhang;Guihao Zhai;Chao Shen;Peng He;Ruiqing Cheng;Lei Yin;Yuyu Yao;Marshet Getaye Sendeku;Zhenxing Wang;Xubing Ye;Chuansheng Liu;Chao Jiang;Chongxin Shan;Youwen Long;Jun He
磁性的操纵为数据存储和自旋电子学应用的发展提供了一个独特的机会。到目前为止，电气控制，压力调谐，堆叠结构的依赖性，和纳米工程已经实现。然而，随着尺寸的减小，铁磁相变温度（Tc）降低是铁磁体的普遍趋势。在此，我们突破性地实现了1和2晶胞（UC）Cr2Te3的合成，发现了二维Cr2Te3的室温铁磁性。新发现的超导体的Tc从厚片（40.3nm）的160K增加到6UC Cr2Te3（7.1nm）的280K。磁化强度和异常霍尔效应的测量提供了明确的证据，在室温下的自发磁化的存在。理论模型表明，Cr_2Te_3的重构可导致反常的厚度依赖性Tc。这种尺寸调谐方法为铁磁性的操控开辟了一条新的途径。
The manipulation of magnetism provides a unique opportunity for the development of data storage and spintronic applications. Until now, electrical control, pressure tuning, stacking structure dependence, and nanoscale engineering have been realized. However, as the dimensions are decreased, the decrease of the ferromagnetism phase transition temperature (Tc) is a universal trend in ferromagnets. Here, we make a breakthrough to realize the synthesis of 1 and 2 unit cell (UC) Cr2Te3and discover a room-temperature ferromagnetism in two-dimensional Cr2Te3. The newly observedTcincreases strongly from 160 K in the thick flake (40.3 nm) to 280 K in 6 UC Cr2Te3(7.1 nm). The magnetization and anomalous Hall effect measurements provided unambiguous evidence for the existence of spontaneous magnetization at room temperature. The theoretical model revealed that the reconstruction of Cr2Te3could result in anomalous thickness-dependentTc. This dimension tuning method opens up a new avenue for manipulation of ferromagnetism.