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2001

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/22084

Monte Carlo study of the finite-size effects on the magnetization of maghemite small particles

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http://dx.doi.org/10.1063/1.1355354

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

Subject

Mètode de Montecarlo, Magnetisme, Propietats magnètiques, Matèria condensada

Subject (English)

Magnetic properties, Condensed matter

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

IGLESIAS, Òscar, LABARTA, Amílcar and RITORT FARRAN, Fèlix. Monte Carlo study of the finite-size effects on the magnetization of maghemite small particles. Journal of Applied Physics. 2001. Vol. 89, num. 11, pags. 7597-7599. ISSN 0021-8979. [consulted: 10 of August of 2026]. Available at: https://hdl.handle.net/2445/22084

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