Abstract
We present Monte Carlo simulations of Ho magnetic thin films. We consider a Heisenberg model with easy-plane single ion anisotropy and seven coupling constant, obtained by experimental neutron scattering measurements. For the analysed thicknesses ( n = 9 – 16 ) , increasing the temperature the films show, after the distorted helical configuration, a temperature range where the inner planes are disordered, while the surface ones appear in a block ordered state. At low temperatures, we also show that the progressive thickness reduction does not entail a sudden helical order suppression, but rather a gradual passage to a fan-like order is observed, driven by the helix distortion related to the surface effects.
Published Version
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