Magnetic behavior of a nano-disk constrained in an antiferromagnetic substrate |
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Authors: | JCS Rocha BV Costa PZ Coura SA Leonel RA Dias |
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Institution: | 1. Departamento de Física, Laboratório de Simulação, ICEX, UFMG, 30123-970 Belo Horizonte, MG, Brazil;2. Departamento de Física, ICE, UFJF, 36036-330 Juiz de Fora, MG , Brazil |
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Abstract: | In this work we report a numerical Monte Carlo study of the behavior of a magnetic nano-disk put over an antiferromagnetic substrate. Three approaches were considered for describe the substrate: (1) A stacked antiferromagnetic configuration, (2) an Ising like arrangement and (3) Heisenberg like spins. For the Heisenberg case we still have considered an easy-plane and an easy-axis symmetry of the substrate. The hysteresis loop for the nano-disk is obtained by considering the three cases. The signature of the vortex in the nano-disk appears as small jumps in the hysteresis curve. Exchange bias effects are observed since the substrate has an easy axis symmetry. |
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Keywords: | Exchange bias Magnetic nano-disk Monte Carlo Heisenberg Dipolar interaction |
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