Exchange bias and asymmetric hysteresis loops from a microscopic model of core/shell nanoparticles

Abstract

We present Monte Carlo simulations of hysteresis loops of a model of a magnetic nanoparticle with a ferromagnetic core and an antiferromegnetic shell with varying values of the core/shell interface exchange coupling which aim to clarify the microscopic origin of exchange bias observed experimentally. We have found loops shifts in the field direction as well as displacements along the magnetization axis that increase in magnitude when increasing the interfacial exchange coupling. Ovelap functions computed from the spin configurations along the loops have been computed to explain the origin and magnitude of these features microscopically.

arXiv comment3 pages, 3 figures. To be presented at the 3rd JEMS 2006, San Sebastian (Spain), June 26-30th 2006; Exchange Bias Symposium. More information at this web page: http://hermes.ffn.ub.es/oscar/Articles.html

References in corpus (5)

• Monte Carlo Simulations of Spin Glasses at Low Temperatures
• Origin of asymmetric reversal modes in ferromagnetic/antiferromagnetic multilayers
• Microscopic origin of exchange bias in core/shell nanoparticles
• Reversal-Field Memory in the Hysteresis of Spin Glasses
• Monte Carlo simulation study of exchange biased hysteresis loops in nanoparticles

Cited by in corpus (5)

• Magnetic nanoparticles: from the nanostructure to the physical properties
• Exchange Bias Effect in Au-Fe3O4 Nanocomposites
• Modelling exchange bias in core/shell nanoparticles
• Particle size and cooling field dependence of exchange bias in core/shell magnetic nanoparticles
• Hole doping in compositionally complex correlated oxide enables tunable exchange biasing