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Title: Monte Carlo study of the finite-size effects on the magnetization of maghemite small particles
Author: Iglesias, Òscar
Labarta, Amílcar
Ritort Farran, Fèlix
Keywords: Mètode de Montecarlo
Propietats magnètiques
Matèria condensada
Magnetic properties
Condensed matter
Issue Date: 2001
Publisher: American Institute of Physics
Abstract: Monte Carlo simulations of a model for gamma-Fe2O3 (maghemite) single particle of spherical shape are presented aiming at the elucidation of the specific role played by the finite size and the surface on the anomalous magnetic behavior observed in small particle systems at low temperature. The influence of the finite-size effects on the equilibrium properties of extensive magnitudes, field coolings, and hysteresis loops is studied and compared to the results for periodic boundaries. It is shown that for the smallest sizes the thermal demagnetization of the surface completely dominates the magnetization while the behavior of the core is similar to that of the periodic boundary case, independently of D. The change in shape of the hysteresis loops with D demonstrates that the reversal mode is strongly influenced by the presence of broken links and disorder at the surface
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It is part of: Journal of Applied Physics, 2001, vol. 89, núm. 11, p. 7597-7599
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ISSN: 0021-8979
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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