Tunable Room-Temperature Ferromagnetism in Two-Dimensional Cr2Te3

被引：249

作者：

Wen, Yao ^{[3
]}

Liu, Zhehong ^{[1
]}

Zhang, Yu ^{[3
]}

Xia, Congxin ^{[4
]}

Zhai, Baoxing ^{[4
]}

Zhang, Xinhui ^{[5
]}

Zhai, Guihao ^{[5
]}

Shen, Chao ^{[5
]}

He, Peng ^{[6
]}

Cheng, Ruiqing ^{[6
]}

Yin, Lei ^{[6
]}

Yao, Yuyu ^{[6
]}

Sendeku, Marshet Getaye ^{[6
]}

Wang, Zhenxing ^{[6
]}

Ye, Xubing ^{[1
]}

Liu, Chuansheng ^{[3
]}

Jiang, Chao ^{[6
]}

Shan, Chongxin ^{[7
]}

Long, Youwen ^{[1
,2
]}

He, Jun ^{[3
]}

机构：

[1] Univ Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100049, Peoples R China

[2] Songshan Lake Mat Lab, Dongguan 523808, Guangdong, Peoples R China

[3] Wuhan Univ, Sch Phys & Technol, Wuhan 430072, Peoples R China

[4] Henan Normal Univ, Dept Phys, Xinxiang 453007, Henan, Peoples R China

[5] Univ Chinese Acad Sci, Inst Semicond, State Key Lab Superlattices & Microstruct, Beijing 100049, Peoples R China

[6] Univ Chinese Acad Sci, CAS Ctr Excellence Nanosci, Natl Ctr Nanosci & Technol, Beijing 100049, Peoples R China

[7] Zhengzhou Univ, Henan Key Lab Diamond Optoelect Mat & Devices, Sch Phys & Engn, Zhengzhou 450052, Peoples R China

来源：

NANO LETTERS | 2020年 / 20卷 / 05期

基金：

中国国家自然科学基金;

关键词：

Room-temperature ferromagnetism; anomalous Hall effect; 1 unit cell; reconstruction; NEUTRON-DIFFRACTION; CURIE-TEMPERATURE; FILMS; MAGNETISM; TRANSITION; DISCOVERY; ORDER;

D O I：

10.1021/acs.nanolett.9b05128

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

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 (T-c) is a universal trend in ferromagnets. Here, we make a breakthrough to realize the synthesis of 1 and 2 unit cell (UC) Cr2Te3 and discover a room-temperature ferromagnetism in two-dimensional Cr2Te3. The newly observed T-c increases 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 Cr2Te3 could result in anomalous thickness-dependent T-c. This dimension tuning method opens up a new avenue for manipulation of ferromagnetism.

引用

页码：3130 / 3139

页数：10

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