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Quantum phenomena at interfaces create functionalities at the level ofmaterials. Ferromagnetism in van der Waals systems with diverse arrangements ofspins opened a pathway for utilizing proximity magnetic fields to activateproperties of materials which would otherwise require external stimuli.Herewith, we realize this notion via creating heterostructures comprising bulkCrCl$_3$ ferromagnet with in-plane easy-axis magnetization and monolayerWSe$_2$ semiconductor. We demonstrate that the in-plane component of theproximity field activates the dark excitons within WSe$_2$. Zero-external-fieldemission from the dark states allowed us to establish the in-plane andout-of-plane components of the proximity field via inspection of the emissionintensity and Zeeman effect, yielding canted orientations at the degree rangeof $10^{\circ}$ $-$ $30^{\circ}$ at different locations of theheterostructures, attributed to the features of interfacial topography. Ourfindings are relevant for the development of spintronics and valleytronics withlong-lived dark states in technological timescales and sensing applications oflocal magnetic fields realized simultaneously in multiple dimensions.

Multidimensional sensing of proximity magnetic fields via intrinsic activation of dark excitons in WSe$_2$/CrCl$_3$ heterostructure