Voltage sensitivity of Curie temperature in ultrathin metallic films

In ferromagnetic metals, the surface enhancement of magnetization and the surface magnetic anisotropy are known to be coupled to the surface charge, sigma, controllable by bias voltage. In the critical region, these surface parameters are nonlocal relevant fields, from which the Curie temperature of an ultrathin film, T(C), should borrow the dependence on sigma. Studying this phenomenon in the 3d transition metals, we find a significant sensitivity of T(C) to the charging. Our results suggest the possibility of the near-critical voltage control of the very existence of magnetization in ultrathin metallic films, which can be useful for the future development of spintronics devices.