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Escalating Ferromagnetic Order via Se-Vacancies Near Vanadium in WSe2 Monolayers

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Title
Escalating Ferromagnetic Order via Se-Vacancies Near Vanadium in WSe2 Monolayers
Author(s)
Seok Joon Yun; Byeong Wook Cho; Dinesh, Thapa; Yang, Dae Hee; Yong In Kim; Jin, Jeong Won; Yang, Sang-Hyeok; Tuan Dung Nguyen; Kim, Young-Min; Ki Kang Kim; Dinh Loc Duong; Kim, Seong-Gon; Young Hee Lee
Publication Date
2022-03
Journal
ADVANCED MATERIALS, v.34, no.10
Publisher
WILEY-V C H VERLAG GMBH
Abstract
Copyright © 1999-2022 John Wiley & Sons, Inc. Magnetic order has been proposed to arise from a variety of defects, including vacancies, antisites, and grain boundaries, which are relevant in numerous electronics and spintronics applications. Nevertheless, its magnetism remains controversial due to the lack of structural analysis. The escalation of ferromagnetism in vanadium-doped WSe2 monolayer is herein demonstrated by tailoring complex configurations of Se vacancies (Se-Vac) via post heat-treatment. Structural analysis of atomic defects is systematically performed using transmission electron microscopy (TEM), enabled by the monolayer nature. Temperature-dependent magnetoresistance hysteresis ensures enhanced magnetic order after high-temperature heat-treatment, consistent with magnetic domain analysis from magnetic force microscopy (MFM). The vanadium-Se vacancy pairing is a key to promoting ferromagnetism via spin-flip by electron transfer, predicted from density-functional-theory (DFT) calculations. The approach toward nanodefect engineering paves a way to overcome weak magnetic order in diluted magnetic semiconductors (DMSs) for renovating semiconductor spintronics.
URI
https://pr.ibs.re.kr/handle/8788114/11587
DOI
10.1002/adma.202106551
ISSN
0935-9648
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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