We present Monte Carlo simulations of Homagnetic 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 = 9-6), 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.

Magnetic phase transition in ultrathin helimagnetic Ho films / F. Cinti; A. Cuccoli; A. Rettori. - In: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS. - ISSN 0304-8853. - STAMPA. - 322(2010), pp. 1334-1336. [10.1016/j.jmmm.2009.03.066]

Magnetic phase transition in ultrathin helimagnetic Ho films

CINTI, FABIO;CUCCOLI, ALESSANDRO;RETTORI, ANGELO
2010

Abstract

We present Monte Carlo simulations of Homagnetic 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 = 9-6), 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.
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1336
F. Cinti; A. Cuccoli; A. Rettori
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2158/384239
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