Fe-Intercalation Dominated Ferromagnetism of van der Waals Fe3GeTe2

被引：15

作者：

Wu, Yueshen ^{[1
]}

Hu, Yuxiong ^{[1
]}

Wang, Cong ^{[2
,3
]}

Zhou, Xiang ^{[1
,4
]}

Hou, Xiaofei ^{[1
,4
]}

Xia, Wei ^{[1
,4
]}

Zhang, Yiwen ^{[1
,4
]}

Wang, Jinghui ^{[1
,4
]}

Ding, Yifan ^{[1
,4
]}

He, Jiadian ^{[1
,4
]}

Dong, Peng ^{[1
,4
]}

Bao, Song ^{[5
,6
]}

Wen, Jinsheng ^{[5
,6
]}

Guo, Yanfeng ^{[1
,4
]}

Watanabe, Kenji ^{[7
]}

Taniguchi, Takashi ^{[8
]}

Ji, Wei ^{[2
]}

Wang, Zhu-Jun ^{[1
]}

Li, Jun ^{[1
,9
,10
]}

机构：

[1] ShanghaiTech Univ, Sch Phys Sci & Technol, Shanghai 201210, Peoples R China

[2] Renmin Univ China, Dept Phys, Beijing Key Lab Optoelect Funct Mat & Micronano De, Beijing 100872, Peoples R China

[3] Renmin Univ China, Key Lab Quantum State Construction & Manipulat, Minist Educ, Beijing 100872, Peoples R China

[4] ShanghaiTech Univ, ShanghaiTech Lab Topol Phys, Shanghai 200031, Peoples R China

[5] Nanjing Univ, Sch Phys, Nanjing 210093, Peoples R China

[6] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, Nanjing 210093, Peoples R China

[7] Natl Inst Mat Sci, Res Ctr Funct Mat, 1-1 Namiki, Tsukuba 3050044, Japan

[8] Natl Inst Mat Sci, Int Ctr Mat Nanoarchitecton, 1-1 Namiki, Tsukuba 3050044, Japan

[9] Chinese Acad Sci, Shanghai Inst Microsyst & Informat Technol, State Key Lab Funct Mat Informat, 865 Changning Rd, Shanghai 200050, Peoples R China

[10] Huazhong Univ Sci & Technol, Wuhan Natl High Magnet Field Ctr, Wuhan 430074, Peoples R China

来源：

ADVANCED MATERIALS | 2023年 / 35卷 / 36期

基金：

中国国家自然科学基金; 上海市自然科学基金; 中国博士后科学基金;

关键词：

2D materials; exchange bias; ferromagnetism; 2D MATERIALS;

D O I：

10.1002/adma.202302568

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Fe3GeTe2 have proven to be of greatly intrigue. However, the underlying mechanism behind the varying Curie temperature (T-c) values remains a puzzle. This study explores the atomic structure of Fe3GeTe2 crystals exhibiting T-c values of 160, 210, and 230 K. The elemental mapping reveals a Fe-intercalation on the interstitial sites within the van der Waals gap of the high-T-c (210 and 230 K) samples, which are observed to have an exchange bias effect by electrical transport measurements, while Fe intercalation or the bias effect is absent in the low-T-c (160 K) samples. First-principles calculations further suggest that the Fe-intercalation layer may be responsible for the local antiferromagnetic coupling that gives rise to the exchange bias effect, and that the interlayer exchange paths greatly contribute to the enhancement of T-c. This discovery of the Fe-intercalation layer elucidates the mechanism behind the hidden antiferromagnetic ordering that underlies the enhancement of T-c in Fe3GeTe2.

引用

页数：9

共 44 条

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