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Structure and energy of the magnetic nanodisk


V.S. Semenov – Main Research Scientist, V.A. Trapeznikov Institute of Control Sciences of RAS (Moscow)

In this paper, we consider a model for the distribution of magnetization in a magnetic nanodisk. This model represents two areas: ex-ternal and internal. In the outer region of the magnetic nanodisk, the magnetization changes in the plane of the nanodisk, and in the inner region the magnetization vector turns out perpendicular to the plane of the disk, forming the core of the vortex. The equilibrium state of a given configuration of magnetization is determined by the minimum of the sum of the exchange energy and the magnetostatic energy. The dependence between the thickness and diameter of a nanodisk is determined. The scientific results obtained in this direction are the basis for the creation of data carriers with high recording density, new types of magnetoresistive memory, high-sensitivity magnetic field sensors etc., which are characterized by reliability, stability, low power consumption and high speed.

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