The influence of magnetic impurities in the vortex core dynamics in magnetic nano-disks

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:324

Article

Silva, J. H.¹  Toscano, D.¹  Sato, F.¹  Coura, P. Z.¹  Costa, B. V.²  Leonel, S. A.¹ 

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

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

关键词: Magnetic nano-disk;    Spin dynamic;    Heisenberg;    Dipolar interaction;    Gyrotropic frequency;   

DOI  :  10.1016/j.jmmm.2012.05.006

来源: Elsevier

【 摘 要 】

In this work we have used spin dynamics simulations to study the gyrotropic frequency behavior in nano-disks of Permalloy with magnetic impurities. We consider the effect of attractive impurity and repulsive impurity placed near the vortex core gyrotropic trajectory. We observed that the gyrotropic frequency is affected by the presence of impurity. The gyrotropic frequency shift depends on the relative position between the impurity and the vortex core gyrotropic trajectory and if impurity is attractive or repulsive. Our results agree with the analytical model and with experimental behavior for the gyrotropic frequency shown in the literature. (C) 2012 Elsevier BY. All rights reserved.

【 授权许可】

Free