Magnetic behavior of a nano-disk constrained in an antiferromagnetic substrate

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

Rocha, J. C. S.²  Costa, B. V.²  Coura, P. Z.¹  Leonel, S. A.¹  Dias, R. A.¹ 

[1] Univ Fed Juiz de Fora, Dept Fis, ICE, BR-36036330 Juiz de Fora, MG, Brazil

[2] Univ Fed Minas Gerais, Dept Fis, Lab Simulacao, ICEX, BR-30123970 Belo Horizonte, MG, Brazil

关键词: Exchange bias;    Magnetic nano-disk;    Monte Carlo;    Heisenberg;    Dipolar interaction;   

DOI  :  10.1016/j.jmmm.2012.02.028

来源: Elsevier

【 摘 要 】

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. (C) 2012 Published by Elsevier B.V.

【 授权许可】

Free