Neel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures

Title
Neel-type skyrmions and their current-induced motion in van der Waals ferromagnet-based heterostructures
Authors
장준연구현철박태언송경미김성종김광수Licong PengJinghua LiangAli HallalFehmi Sami YasinXichao ZhangMarkus WeigandGisela SchutzSimone FinizioJorg RaabeKarin GarciaJing XiaYan ZhouMotohiko EzawaXiaoxi LiuYoung Duck KimMairbek ChshievAlbert FertHongxin YangXiuzhen YuSeonghoon Woo
Issue Date
2021-03
Publisher
Physical review B, Condensed matter and materials physics
Citation
VOL 103, NO 10, 104410
Abstract
Since the discovery of ferromagnetic two-dimensional (2D) van der Waals (vdW) crystals, significant interest on such 2D magnets has emerged, inspired by their appealing physical properties and integration with other 2D family for unique heterostructures. In known 2D magnets, spin-orbit coupling (SOC) stabilizes perpendicular magnetic anisotropy down to one or a few monolayers. Such a strong SOC could also lift the chiral degeneracy, leading to the formation of topological magnetic textures such as skyrmions through the Dzyaloshinskii-Moriya interaction (DMI). Here, we report the experimental observation of N?el-type chiral magnetic skyrmions and their lattice (SkX) formation in a vdW ferromagnet Fe3GeTe2 (FGT). We demonstrate the ability to drive an individual skyrmion by short current pulses along a vdW heterostructure, FGT/h-BN, as highly required for any skyrmion-based spintronic device. Using first principle calculations supported by experiments, we unveil the origin of DMI being the interfaces with oxides, which then allows us to engineer vdW heterostructures for desired chiral states. Our finding opens the door to topological spin textures in the 2D vdW magnet and their potential device application.
URI
http://pubs.kist.re.kr/handle/201004/73001
ISSN
2469-9950
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