INVESTIGADORES
DE BIASI Emilio
artículos
Título:
Metropolis algorithm for simulating hysteresis in ferromagnetic nanoparticles
Autor/es:
DE BIASI EMILIO; RAMOS CARLOS; ZYSLER ROBERTO; FIORANI DINO
Revista:
PHYSICA B - CONDENSED MATTER
Referencias:
Año: 2006 vol. 372 p. 345 - 349
ISSN:
0921-4526
Resumen:
We report of Monte Carlo simulations by Metropolis algorithm of the magnetization cycles of 3 nm non-interacting ferromagnetic
amorphous nanoparticles. Simulations based on a core-shell model, describing the nanoparticles as consisting of a ferromagnetically
ordered core and a disordered surface shell, reproduce satisfactorily the significant features observed in experimental magnetization
measurement and hysteresis cycles, i.e. HCðTÞ and MrðTÞ curves. The results provide a clear evidence of the major role played at low
temperature by the surface anisotropy and surfacecore exchange interaction in determining some anomalies of the hysteresis cycles and
the large increase of the effective particle anisotropy at low temperature.3 nm non-interacting ferromagnetic
amorphous nanoparticles. Simulations based on a core-shell model, describing the nanoparticles as consisting of a ferromagnetically
ordered core and a disordered surface shell, reproduce satisfactorily the significant features observed in experimental magnetization
measurement and hysteresis cycles, i.e. HCðTÞ and MrðTÞ curves. The results provide a clear evidence of the major role played at low
temperature by the surface anisotropy and surfacecore exchange interaction in determining some anomalies of the hysteresis cycles and
the large increase of the effective particle anisotropy at low temperature.HCðTÞ and MrðTÞ curves. The results provide a clear evidence of the major role played at low
temperature by the surface anisotropy and surfacecore exchange interaction in determining some anomalies of the hysteresis cycles and
the large increase of the effective particle anisotropy at low temperature.