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원자제어 저차원 전자계 연구단
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Tunable high-temperature itinerant antiferromagnetism in a van der Waals magnet

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Title
Tunable high-temperature itinerant antiferromagnetism in a van der Waals magnet
Author(s)
Junho Seo; Eun Su An; Park, Taesu; Hwang, Soo-Yoon; Kim, Gi-Yeop; Song, Kyung; Noh, Woo-suk; Kim, Jae-Young; Gyu Seung Choi; Minhyuk Choi; Eunseok Oh; Watanabe, Kenji; Taniguchi, Takashi; Park, J.-H.; Jo, Youn Jung; Han Woong Yeom; Choi, Si-Young; Shim, Ji Hoon; Jun Sung Kim
Publication Date
2021-05
Journal
Nature Communications, v.12, no.1
Publisher
Nature Research
Abstract
© 2021, The Author(s).Discovery of two dimensional (2D) magnets, showing intrinsic ferromagnetic (FM) or antiferromagnetic (AFM) orders, has accelerated development of novel 2D spintronics, in which all the key components are made of van der Waals (vdW) materials and their heterostructures. High-performing and energy-efficient spin functionalities have been proposed, often relying on current-driven manipulation and detection of the spin states. In this regard, metallic vdW magnets are expected to have several advantages over the widely-studied insulating counterparts, but have not been much explored due to the lack of suitable materials. Here, we report tunable itinerant ferro- and antiferromagnetism in Co-doped Fe4GeTe2 utilizing the vdW interlayer coupling, extremely sensitive to the material composition. This leads to high TN antiferromagnetism of TN ~ 226 K in a bulk and ~210 K in 8 nm-thick nanoflakes, together with tunable magnetic anisotropy. The resulting spin configurations and orientations are sensitively controlled by doping, magnetic field, and thickness, which are effectively read out by electrical conduction. These findings manifest strong merits of metallic vdW magnets as an active component of vdW spintronic applications.
URI
https://pr.ibs.re.kr/handle/8788114/10110
DOI
10.1038/s41467-021-23122-y
ISSN
2041-1723
Appears in Collections:
Center for Artificial Low Dimensional Electronic Systems(원자제어 저차원 전자계 연구단) > 1. Journal Papers (저널논문)
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