Abstract
In ferromagnetic metals, the surface enhancement of magnetization and the surface magnetic anisotropy are known to be coupled to the surface charge, $\ensuremath{\sigma}$, 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 $\ensuremath{\sigma}$. 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.
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