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강상관계 물질 연구단
강상관계 물질 연구단
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Hard ferromagnetic van-der-Waals metal (Fe,Co)3GeTe2: A new platform for the study of low-dimensional magnetic quantum criticality

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Title
Hard ferromagnetic van-der-Waals metal (Fe,Co)3GeTe2: A new platform for the study of low-dimensional magnetic quantum criticality
Author(s)
Inho Hwang; Matthew J Coak; Nahyun Lee; Dong-Su Ko; Youngtek Oh; Insu Jeon; Suhan Son; Kaixuan Zhang; Junghyun Kim; Je-Geun Park
Publication Date
2019-09
Journal
JOURNAL OF PHYSICS-CONDENSED MATTER, v.31, no.50, pp.50LT01 -
Publisher
IOP PUBLISHING LTD
Abstract
© 2019 IOP Publishing Ltd.The widely-studied ferromagnetic van-der-Waals (vdW) metal Fe3GeTe2 has great promise for studies of quantum criticality in the 2D limit, but is limited by a relatively high Curie temperature in excess of 200 K. To help render the quantum critical point achievable in such a system within the reach of practically possible tuning methods, we have grown single crystals of a variant of (Fe,Co)3GeTe2 with useful physical properties for both this purpose and the wider study of low-dimensional magnetism and spin transport. (Fe,Co)3GeTe2 is found through X-ray diffraction and electron microscopy to have an equivalent crystal structure to Fe3GeTe2, with a random distribution of the cobalt dopant sites. It exhibits a sharp ferromagnetic transition at a value below 40 K, a stronger anisotropy and a coercive field ten times larger than that of Fe3GeTe2. The transport properties and specific heat show the electronic properties and strong correlations of Fe3GeTe2 to be near-unchanged in this doped material. We demonstrate that (Fe,Co)3GeTe2 can be cleanly exfoliated down to monolayer thickness. This unprecedented hard metallic vdW ferromagnet is a valuable new addition to the limited range of materials available for the study of 2D magnetism
URI
https://pr.ibs.re.kr/handle/8788114/6518
ISSN
0953-8984
Appears in Collections:
Center for Correlated Electron Systems(강상관계 물질 연구단) > Journal Papers (저널논문)
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