Abstract
Magnetic van der Waals (vdW) materials have emerged as promising candidates for spintronics applications, especially after the discovery of intrinsic ferromagnetism in monolayer vdW materials. Here, we report a real-space imaging study of itinerant ferromagnet Fe3GeTe2 and the enhancement of its Curie temperature well above ambient temperature [1]. We later found implanting Ga into Fe3GeTe2 could greatly enhance the Fe3GeTe2 Curie temperature by almost 100% [2]. Magnetic skyrmions are topological spin textures, which usually exist in noncentrosymmetric materials where the crystal inversion symmetry breaking generates the so-called Dzyaloshinskii-Moriya interaction. Using photoemission electron microscopy and Lorentz transmission electron microscopy, we investigated and stabilized Néel-type magnetic skyrmion in vdW ferromagnetic Fe3GeTe2 on top of (Co/Pd)n without the need of an external magnetic field.
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