Anomalous magnetotransport in Van der Waals ferromagnet Fe₂GeTe₃

Ferromagnetic Van der Waals (VdW) materials have recently emerged as a new member of two dimensional (2d) material family. In addition to potential application in spintronics industry, layered ferromagnets often exhibit exotic physical properties in stark contrast with traditional magnetic thin films. This family of materials retain their structural stability even down to monolayer limit. Through mechanical exfoliation, samples with different geometries are readily available, which may manifest drastically different behaviours. In this work, we report the anomalous magnetotransport in exfoliated Fe₂GeTe₃ nano flakes with a thickness step. The observed antisymmetric magnetoresistance and stepped anomalous Hall resistance indicate a circulation of electric current around the step with two magnetic domains at each side. Furthermore, the direction of the circulation is shown to have a dependence on the relative coercive field of two sides. Our work may pave the way for future magnetic information encoding with domain wall manipulation in ultrathin 2d materials.