Sublimation Rate of Cobalt near Its Curie Temperature

Abstract

Measurements are reported of the sublimation rate of cobalt in the vicinity of its Curie temperature ($T_{\mathrm{C}}=1400\mathrm{}$ K) which show a relatively large change (∼0.8 eV/atom) in the apparent activation energy for sublimation near $T_{\mathrm{C}}$. The results can be accounted for in terms of a simple model that incorporates into the sublimation process the temperature dependence of the magnetic contribution to the binding energy of a cobalt surface atom.