Ga. Gehring et M. Keskin, THE TEMPERATURE-DEPENDENCE OF THE DOMAIN SPACING IN ULTRATHIN MAGNETIC-FILMS, Journal of physics. Condensed matter, 5(44), 1993, pp. 581-585
We study the domains in an ultrathin magnetic layer with perpendicular
magnetization as a function of temperature. The domain spacing is giv
en by the balance between the interface energy and the demagnetizing e
nergy. The demagnetizing energy is calculated in a continuum theory wh
ich is valid provided that the domains are large compared with the lat
tice spacing. The temperature dependence of the interface energy arise
s from the entropy of the rough walls. This is obtained from the exact
results for the two-dimensional Ising model. We predict that the doma
in size shrinks rapidly as the temperature is raised towards the trans
ition.