Fig. 1: Magnetic field dependence of the MR in orthogonally twisted bilayer CrSBr.
From: Multistep magnetization switching in orthogonally twisted ferromagnetic monolayers
a, Optical image of a vertical vdW heterostructure consisting of twisted CrSBr monolayers (black dashed lines) in between few-layer graphene (blue dashed lines). Different insulating hexagonal boron nitride layers (green dashed lines) are used both to avoid shortcuts and to protect the heterostructure. The red arrows indicate the easy magnetic axis (b) of each CrSBr monolayer, with the intermediate magnetic axis (a) perpendicular to it. The hard magnetic axis (c) corresponds to the out-of-plane direction. Scale bar, 5 µm. b, Schematic view of the heterostructure (not to scale), highlighting the twisted CrSBr monolayers placed in between few-layer graphene or NbSe2 thin layers (blue) on top of pre-patterned electrodes (gold) together with a sketch of the electrical measurement configuration (I refers to current and V to voltage). Pink, yellow and cyan balls correspond to bromine, sulfur and chromium atoms, respectively. The red arrows represent the spin lying along the easy magnetic axis, assuming negligible interlayer magnetic interactions. c,d, Field dependence of the resistance (R) and the MR (bottom) and its increment (top), defined as ΔX = X+B→−B − X−B→+B, where X indicates either the resistance or the MR at T = 10 K and θ = φ = 0º. The sweeping up (down) trace is depicted in red (blue). The red and blue arrows indicate the sweeping direction of the magnetic field. The black arrows sketch the relative configuration of both layers’ magnetization. MR is defined as MR (%) = 100[R(B) – R(0)]/R(0), where R(0) is the resistance obtained at zero field. Panel d shows a zoom of panel c. e–g, Reference experiments on pristine monolayer CrSBr and pristine bilayer CrSBr based on our previous work9, including the corresponding sketches (e) and field dependence of the MR for fields applied along the easy (b), intermediate (a) and hard (c) magnetic axes for pristine monolayer (f) and bilayer (g, left (right) figure shows a broad (small) field range) at T = 10 K.
