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Stability of single skyrmionic bits

Author

Listed:
  • J. Hagemeister

    (Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg, University of Hamburg)

  • N. Romming

    (Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg, University of Hamburg)

  • K. von Bergmann

    (Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg, University of Hamburg)

  • E. Y. Vedmedenko

    (Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg, University of Hamburg)

  • R. Wiesendanger

    (Institute of Applied Physics and Interdisciplinary Nanoscience Center Hamburg, University of Hamburg)

Abstract

The switching between topologically distinct skyrmionic and ferromagnetic states has been proposed as a bit operation for information storage. While long lifetimes of the bits are required for data storage devices, the lifetimes of skyrmions have not been addressed so far. Here we show by means of atomistic Monte Carlo simulations that the field-dependent mean lifetimes of the skyrmionic and ferromagnetic states have a high asymmetry with respect to the critical magnetic field, at which these lifetimes are identical. According to our calculations, the main reason for the enhanced stability of skyrmions is a different field dependence of skyrmionic and ferromagnetic activation energies and a lower attempt frequency of skyrmions rather than the height of energy barriers. We use this knowledge to propose a procedure for the determination of effective material parameters and the quantification of the Monte Carlo timescale from the comparison of theoretical and experimental data.

Suggested Citation

  • J. Hagemeister & N. Romming & K. von Bergmann & E. Y. Vedmedenko & R. Wiesendanger, 2015. "Stability of single skyrmionic bits," Nature Communications, Nature, vol. 6(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms9455
    DOI: 10.1038/ncomms9455
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