Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/10919
Title: Microscopic origin of exchange bias in core/shell nanoparticles
Author: Iglesias, Òscar
Batlle Gelabert, Xavier
Labarta, Amílcar
Keywords: Propietats magnètiques
Termodinàmica
Mètode de Montecarlo
Física estadística
Magnetic properties
Thermodynamics
Monte Carlo method
Statistical physics
Issue Date: 2005
Publisher: The American Physical Society
Abstract: We report the results of Monte Carlo simulations with the aim to clarify the microscopic origin of exchange bias in the magnetization hysteresis loops of a model of individual core/shell nanoparticles. Increase of the exchange coupling across the core/shell interface leads to an enhancement of exchange bias and to an increasing asymmetry between the two branches of the loops which is due to different reversal mechanisms. A detailed study of the magnetic order of the interfacial spins shows compelling evidence that the existence of a net magnetization due to uncompensated spins at the shell interface is responsible for both phenomena and allows to quantify the loop shifts directly in terms of microscopic parameters with striking agreement with the macroscopic observed values.
Note: Reproducció digital del document publicat en format paper, proporcionada per PROLA i http://dx.doi.org/10.1103/PhysRevB.72.212401
It is part of: Physical Review B, 2005, vol. 72, núm. 21p. 212401-1- 212401-4
URI: http://hdl.handle.net/2445/10919
ISSN: 0163-1829
Appears in Collections:Articles publicats en revistes (Física de la Matèria Condensada)

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