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Defects are ubiquitous in solids and often introduce new properties that are absent in pristine materials. One of the opportunities offered by these crystal imperfections is an extrinsically induced long-range magnetic ordering 1 , a long-time subject of theoretical investigations 1-3 . Intrinsic, two-dimensional (2D) magnetic materials 4-7 are attracting increasing attention for their unique properties, which include layer-dependent magnetism 4 and electric field modulation 6 . Yet, to induce magnetism into otherwise non-magnetic 2D materials remains a challenge. Here we investigate magneto-transport properties of ultrathin PtSe 2 crystals and demonstrate an unexpected magnetism. Our electrical measurements show the existence of either ferromagnetic or antiferromagnetic ground-state orderings that depends on the number of layers in this ultrathin material. The change in the device resistance on the application of a ~25 mT magnetic field is as high as 400 Ω with a magnetoresistance value of 5%. Our first-principles calculations suggest that surface magnetism induced by the presence of Pt vacancies and the Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange couplings across ultrathin films of PtSe 2 are responsible for the observed layer-dependent magnetism. Given the existence of such unavoidable growth-related vacancies in 2D materials 8,9 , these findings can expand the range of 2D ferromagnets into materials that would otherwise be overlooked.

Defect induced, layer-modulated magnetism in ultrathin metallic PtSe2