MAGNETIC VORTEX BEHAVIOR IN NANO-STRUCTURES

B. V. Costa (), J. C. S. Rocha, P. Z. Coura, S. A. Leonel, D. Toscano and R. A. Dias
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B. V. Costa: Departamento de Física, Laboratório de Simulação, ICEX, UFMG, 30123-970, Belo Horizonte, MG, Brazil
J. C. S. Rocha: Departamento de Física, Laboratório de Simulação, ICEX, UFMG, 30123-970, Belo Horizonte, MG, Brazil
P. Z. Coura: Departamento de Física, ICE, UFJF, 36036-330, Juiz de Fora, MG, Brazil
S. A. Leonel: Departamento de Física, ICE, UFJF, 36036-330, Juiz de Fora, MG, Brazil
D. Toscano: Departamento de Física, ICE, UFJF, 36036-330, Juiz de Fora, MG, Brazil
R. A. Dias: Departamento de Física, ICE, UFJF, 36036-330, Juiz de Fora, MG, Brazil

International Journal of Modern Physics C (IJMPC), 2012, vol. 23, issue 08, 1-9

Abstract: The existence of a vortex in the ground state of magnetic nano-disks has open a wide range of possibilities for constructing new ultra-compact devices. In this work we study the dynamical behavior of a vortex in a magnetic nano-particle. First, we introduce magnetic impurities in the system. It is observed that depending on the strength of the interaction the impurities can behave both as a pinning (attractive) or scattering (repulsive). By using the known values of the parameters for Permalloy-79 we have calculated the interaction energy of the vortex core with a single defect. We estimated the interaction range as approximately 10 nm. Both results agree quite well with experimental measurements. As a second point we discuss how the vortex dynamics in nano-disks can be used for building a nano-spin valve.

Keywords: Nano-magnetism; vortex; gyrotropic motion; spin-valve; 85.70.-w; 75.75.Fk (search for similar items in EconPapers)
Date: 2012
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DOI: 10.1142/S0129183112400037

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