Origin of temperature and field dependence of magnetic skyrmion size in ultrathin nanodots

R. Tomasello, K. Y. Guslienko, M. Ricci, A. Giordano, J. Barker, M. Carpentieri, O. Chubykalo-Fesenko, G. Finocchio

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)

Abstract

Understanding the physical properties of magnetic skyrmions is important for fundamental research with the aim to develop new spintronic device paradigms where both logic and memory can be integrated at the same level. Here, we show a universal model based on the micromagnetic formalism that can be used to study skyrmion stability as a function of magnetic field and temperature. We consider ultrathin, circular ferromagnetic magnetic dots. Our results show that magnetic skyrmions with a small radius - compared to the dot radius - are always metastable, while large radius skyrmions form a stable ground state. The change of energy profile determines the weak (strong) size dependence of the metastable (stable) skyrmion as a function of temperature and/or field.

Original languageEnglish
Article number060402
JournalPhysical Review B
Volume97
Issue number6
DOIs
Publication statusPublished - 2018 Feb 9

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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