Patterning-Induced Ferromagnetism of Fe3GeTe2 van der Waals Materials beyond Room Temperature

被引：215

作者：

Li, Qian ^{[1
]}

Yang, Mengmeng ^{[1
]}

Gong, Cheng ^{[2
]}

Chopdekar, Rajesh V. ^{[3
]}

N'Diaye, Alpha T. ^{[3
]}

Turner, John ^{[4
]}

Chen, Gong ^{[5
]}

Schol, Andreas ^{[3
]}

Shafer, Padraic ^{[3
]}

Arenholz, Elke ^{[3
]}

Schmid, Andreas K. ^{[4
]}

Wang, Sheng ^{[1
]}

Liu, Kai ^{[5
,6
]}

Gao, Nan ^{[1
]}

Admasu, Alemayehu S. ^{[7
,8
]}

Cheong, Sang-Wook ^{[7
,8
]}

Hwang, Chanyong ^{[9
]}

Li, Jia ^{[10
]}

Wang, Feng ^{[1
]}

Zhang, Xiang ^{[2
]}

Qiu, Ziqiang ^{[1
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Nanoscale Sci & Engn Ctr NSEC, 3112 Etcheverry Hall, Berkeley, CA 94720 USA

[3] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA

[4] Lawrence Berkeley Natl Lab, Mol Foundry, NCEM, Berkeley, CA 94720 USA

[5] Univ Calif Davis, Dept Phys, Davis, CA 95616 USA

[6] Georgetown Univ, Dept Phys, Washington, DC 20057 USA

[7] Rutgers State Univ, Rutgers Ctr Emergent Mat, Piscataway, NJ 08854 USA

[8] Rutgers State Univ, Dept Phys & Astron, Piscataway, NJ 08854 USA

[9] Korea Res Inst Stand & Sci, Yuseong 305340, Daejeon, South Korea

[10] Peking Univ, Sch Phys, Int Ctr Quantum Mat, Beijing 100871, Peoples R China

来源：

NANO LETTERS | 2018年 / 18卷 / 09期

基金：

新加坡国家研究基金会; 美国国家科学基金会;

关键词：

Magnetic van der Waals material; stripe-domain phase; vortex phase; spin-reorientation transition; room-temperature ferromagnetism; FILMS;

D O I：

10.1021/acs.nanolett.8b02806

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications, especially after the recent discovery of intrinsic ferromagnetism in monolayer vdW materials. There has been a critical need for tunable ferromagnetic vdW materials beyond room temperature. Here, we report a real-space imaging study of itinerant ferromagnet Fe3GeTe2 and the enhancement of its Curie temperature well above ambient temperature. We find that the magnetic long-range order in Fe3GeTe2 is characterized by an unconventional out-of-plane stripe-domain phase. In Fe3GeTe2 microstructures patterned by a focused ion beam, the out-of-plane stripe domain phase undergoes a surprising transition at 230 K to an in-plane vortex phase that persists beyond room temperature. The discovery of tunable ferromagnetism in Fe3GeTe2 materials opens up vast opportunities for utilizing vdW magnets in room-temperature spintronics devices.

引用

页码：5974 / 5980

页数：7

共 42 条

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