  The discovery of 2D materials opens up unprecedented opportunities to design
new materials with specified properties. In many cases, the design guiding
principle is based on one or another proximity effect, i.e. the
nanoscale-penetration of electronic correlations from one material to another.
In a few layer van der Waals (vdW) heterostructures the proximity regions
occupy the entire system. Here we demonstrate that the physics of magnetic and
superconducting proximity effects in 2D superconductor/ferromagnet vdW
heterostructures is determined by the effects of interface hybridization of the
electronic spectra of both materials. The degree of hybridization can be
adjusted by gating, which makes it possible to achieve a high degree of
controllability of the proximity effect. In particular, we show that this
allows for electrical switching of superconductivity in such structures on and
off, as well as for control of the amplitude and sign of the Zeeman splitting
of superconducting spectra.
