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Two-dimensional itinerant ferromagnetism in atomically thin Fe 3 GeTe 2
Nature Materials ( IF 41.2 ) Pub Date : 2018-08-13 , DOI: 10.1038/s41563-018-0149-7
Zaiyao Fei , Bevin Huang , Paul Malinowski , Wenbo Wang , Tiancheng Song , Joshua Sanchez , Wang Yao , Di Xiao , Xiaoyang Zhu , Andrew F. May , Weida Wu , David H. Cobden , Jiun-Haw Chu , Xiaodong Xu

Discoveries of intrinsic two-dimensional (2D) ferromagnetism in van der Waals (vdW) crystals provide an interesting arena for studying fundamental 2D magnetism and devices that employ localized spins1,2,3,4. However, an exfoliable vdW material that exhibits intrinsic 2D itinerant magnetism remains elusive. Here we demonstrate that Fe3GeTe2 (FGT), an exfoliable vdW magnet, exhibits robust 2D ferromagnetism with strong perpendicular anisotropy when thinned down to a monolayer. Layer-number-dependent studies reveal a crossover from 3D to 2D Ising ferromagnetism for thicknesses less than 4 nm (five layers), accompanied by a fast drop of the Curie temperature (TC) from 207 K to 130 K in the monolayer. For FGT flakes thicker than ~15 nm, a distinct magnetic behaviour emerges in an intermediate temperature range, which we show is due to the formation of labyrinthine domain patterns. Our work introduces an atomically thin ferromagnetic metal that could be useful for the study of controllable 2D itinerant ferromagnetism and for engineering spintronic vdW heterostructures5.



中文翻译:

原子薄Fe 3 GeTe 2中的二维流动铁磁性

范德华(vdW)晶体中固有的二维(2D)铁磁性的发现为研究基本2D磁性和采用局部自旋1,2,3,4的设备提供了一个有趣的舞台。但是,具有固有2D巡回磁性的可剥离vdW材料仍然难以捉摸。在这里,我们证明了可剥落的vdW磁体Fe 3 GeTe 2(FGT)在减薄至单层时表现出强大的2D铁磁性,并具有很强的垂直各向异性。依赖层数的研究表明,厚度小于4 nm(5层)的3D到2D Ising铁磁性的交叉,伴随着居里温度(T C)的快速下降)在单层中从207 K到130K。对于厚度大于约15 nm的FGT薄片,在中间温度范围内会出现明显的磁行为,这是由于形成了迷宫磁畴图而引起的。我们的工作介绍了一种原子薄的铁磁性金属,该金属可用于研究可控2D流动铁磁性和工程自旋电子vdW异质结构5

更新日期:2018-08-13
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