Figure 1: Illustration of the experiment and scanning electron microscope (SEM) image of the device.

(a) Sketch of the 2D vdW heterostructure to be used for switching the spin transport. For the non-local measurement, a DC current (10 μA) is injected into graphene from a ferromagnetic Co electrode across a TiO₂ barrier and a non-local voltage (V_nl) is measured by a second Co electrode while sweeping the magnetic field B. The red- and blue-coloured circuit diagrams represent the measurement configurations in the reference graphene LSV (without MoS₂ on top) and the graphene/MoS₂ LSV (with MoS₂ intercepting the spin current path). In the latter case, the spin current flowing in the graphene can be switched ON and OFF by modulating the conductivity of MoS₂ using an electric field across a SiO₂ dielectric (also shown in the diagram). (b) False-coloured SEM image of the LSV devices. The width of the graphene and MoS₂ are and , respectively. Scale bar, 2 μm. (c) An illustration of a typical non-local magnetoresistance measurement, where the non-local resistance R_nl switches between R_P and R_AP for parallel and antiparallel magnetization orientations of the Co electrodes. The spin signal is tagged as ΔR_nl=R_p−R_ap.