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Magnetic Vortex Behavior In Nano-Structures

Author

Listed:
  • 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)

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.

Suggested Citation

  • B. V. Costa & J. C. S. Rocha & P. Z. Coura & S. A. Leonel & D. Toscano & R. A. Dias, 2012. "Magnetic Vortex Behavior In Nano-Structures," International Journal of Modern Physics C (IJMPC), World Scientific Publishing Co. Pte. Ltd., vol. 23(08), pages 1-9.
    • Handle: RePEc:wsi:ijmpcx:v:23:y:2012:i:08:n:s0129183112400037
    DOI: 10.1142/S0129183112400037
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