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2005

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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/10919

Microscopic origin of exchange bias in core/shell nanoparticles

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http://dx.doi.org/10.1103/PhysRevB.72.212401

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.

Subject

Propietats magnètiques, Termodinàmica, Mètode de Montecarlo, Física estadística

Subject (English)

Magnetic properties, Thermodynamics, Monte Carlo method, Statistical physics

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Articles publicats en revistes (Física de la Matèria Condensada)

Citation

IGLESIAS, Òscar, BATLLE GELABERT, Xavier and LABARTA, Amílcar. Microscopic origin of exchange bias in core/shell nanoparticles. Physical Review B. 2005. Vol. 72, num. 21p. ISSN 0163-1829. [consulted: 13 of August of 2026]. Available at: https://hdl.handle.net/2445/10919

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