Magnetic proximity effect in CrPS4 heterostructure*

Recently studied 2D ferromagnetic materials including CrI3 show the intriguing phenomena. However, there remains a challenge for the application due to the chemical instability under atmosphere. Here, we report the observation of an Cr-based air-stable ferromagnetism in magnetic van der Waals material CrPS4, down to monolayer, and its layer-dependent ferromagnetism using magneto-optic Kerr effect microscopy. Besides those ferromagnetism, we also observed the strong proximity effect to superconducting NbSe2 layer and suppression of superconductivity in vicinity of ferromagnetic layer. For the fabriation, strongly adhesive polymer based fabrication, PCL method, should be introduced, which is also briefly discussed.