Extended Data Fig. 2: MCD images of magnetic proximity effects on a different MoSe₂/CrBr₃ heterostructure.

The CrBr₃ thickness is 7 monolayers. a, Optical microscope image of the vdW structure. b, Magnetic hysteresis of the MCD signal, using light tuned to the A-exciton transition of the MoSe₂ monolayer. c, MCD images acquired at 4 K, using probe light tuned to the peak of the A-exciton MCD resonance (photon energy = 1.64 eV), at selected applied magnetic fields B_z. The MoSe₂/CrBr₃ heterostructure region is indicated by the black dashed lines, and red and blue colors reveal magnetic domains oriented along \(+\hat{z}\) and \(-\hat{z}\), respectively. Magnetic domains in CrBr₃ have been studied using a variety of techniques over the past several decades; see for example^44,45.