A Spin‐Texture Spin‐Valves With Van Der Waals Magnets

ABSTRACT All‐electrical methods for nucleating, detecting, and manipulating spin textures in 2D van der Waals (vdW) magnets can serve as fundamental building blocks for multi‐state spintronic memory, logic, and neuromorphic computing applications. However, detection of such spin textures in such vdW magnets has so far been limited to microscopic techniques. Here, we demonstrate all‐electrical detection of spin textures in vdW itinerant ferromagnet Fe ₅ GeTe ₂ using pure spin transport in a lateral graphene spin‐valve device at room temperature. By engineering nanoscale constrictions or notches in Fe ₅ GeTe ₂ , we create spin textures that inject distinct spin polarizations into the graphene channel, where they are nonlocally sensed by a reference ferromagnetic detector. This enables the observation of anomalous multi‐level spin‐valve switching and Hanle spin precession signals, which are due to unique spin textures in Fe ₅ GeTe ₂ and in sharp contrast to single‐domains and conventional magnet‐based devices. This all‐electrical approach can provide direct access to the spin textures on an integrated 2D spintronic circuit without the need for ex situ microscopic characterization.