Precise control of vortex chirality and polarity in ``Pac-Man''-like magnetic nanodots by in-plane magnetic field

ORAL

Abstract

Here we explore size-dependent magnetic states of sub-100 nm Permalloy nanomagnets of specific geometry. The geometry is suitable for independent setting and readout of vortex polarity and chirality by applying \emph{in-plane magnetic fields} only. Micromagnetic calculations show that in ``Pac-Man''-like magnetic nanodots the relaxation channels to specific chirality and polarity states from uniform magnetization state are deterministic and are not influenced by the presence of moderate out-of-plane fields. The particular geometry opens straight channel for magnetization relaxation towards stable closure-domain vortex state with specific chirality and polarity. We explore a wide geometrical phase space in search for stable and predictable remanent vortex configurations. We find that in these nanomagnets the write process is simple and the signal is easily readable.

*This publication is the result of the following project implementations: Development of the Centre of Excellence for New Technologies in Electrical Engineering - 2$^{nd}$ , ITMS code 26240120019, supported by the R \& D Operational Program funded by ERDF.

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Authors

  • Vladimir Cambel

    • Institute of Electrical Engineering, Slovak Academy of Sciences, Slovakia

  • Jaroslav T\'{o}bik

    • Institute of Electrical Engineering, Slovak Academy of Sciences, Slovakia

  • Goran Karapetrov

    • Physics Department, Drexel University, Philadelphia, PA 19104 USA
    • Physics Department, Drexel University
    • Drexel University
    • Physics Department, Drexel University, Philadelphia PA 19104, USA
    • Department of Physics, Drexel University and Institute of Electrical Engineering, Slovak Academy of Sciences