A van der Waals Interface Hosting Two Groups of Magnetic Skyrmions
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Yingying Wu, Brian Francisco, Zhijie Chen, Wei Wang, Yu Zhang, Caihua Wan, Xiufen Han, Hang Chi, Yasen Hou, Alessandro Lodesani, Gen Yin, Kai Liu (+3 others)
Abstract
Multiple magnetic skyrmion phases add an additional degree of freedom for skyrmion based ultrahigh-density spin memory devices. Extending the field to two-dimensional van der Waals magnets is a rewarding challenge, where the realizable degree of freedoms (e.g. thickness, twist angle and electrical gating) and high skyrmion density result in intriguing new properties and enhanced functionality. We report a van der Waals interface, formed by two 2D ferromagnets Cr2 Ge2 Te6 and Fe3 GeTe2 with a Curie temperature of ∼ 65 K and ∼ 205 K, respectively, hosting two groups of magnetic skyrmions. Two sets of topological Hall effect signals are observed below 60 K when Cr2 Ge2 Te6 is magnetically ordered. These two groups of skyrmions are directly imaged using magnetic force microscopy, and supported by micromagnetic simulations. Interestingly, the magnetic skyrmions persist in the heterostructure in the remanent state with zero applied magnetic field. Our results are promising for the realization of skyrmionic devices based on van der Waals heterostructures hosting multiple skyrmion phases. This article is protected by copyright. All rights reserved.
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