Néel-type skyrmion in WTe2/Fe3GeTe2 van der Waals heterostructure.
Yingying WuSenfu ZhangJunwei ZhangWei WangYang Lin ZhuJin HuGen YinKin WongChi FangCaihua WanXiu Feng HanQiming ShaoTakashi TaniguchiKenji WatanabeJiadong ZangZhiqiang MaoXingzhong ZhaoKang L WangPublished in: Nature communications (2020)
The promise of high-density and low-energy-consumption devices motivates the search for layered structures that stabilize chiral spin textures such as topologically protected skyrmions. At the same time, recently discovered long-range intrinsic magnetic orders in the two-dimensional van der Waals materials provide a new platform for the discovery of novel physics and effects. Here we demonstrate the Dzyaloshinskii-Moriya interaction and Néel-type skyrmions are induced at the WTe2/Fe3GeTe2 interface. Transport measurements show the topological Hall effect in this heterostructure for temperatures below 100 K. Furthermore, Lorentz transmission electron microscopy is used to directly image Néel-type skyrmion lattice and the stripe-like magnetic domain structures as well. The interfacial coupling induced Dzyaloshinskii-Moriya interaction is estimated to have a large energy of 1.0 mJ m-2. This work paves a path towards the skyrmionic devices based on van der Waals layered heterostructures.
Keyphrases
- high density
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- ionic liquid
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