Magnetic topological structures in ferromagnetic films with the Dzyaloshinsky–Moriya interaction

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Abstract

The influence of the Dzyaloshinskii–Moriya interaction on the formation and stability of 3D magnetic topological structures in exchange-coupled ferromagnetic films with different magnetic anisotropy has been investigated. The magnetization reversal processes in multilayer systems in the presence of a chiral magnetic layer have been analyzed. It has been shown that during the magnetization reversal, three-dimensional topological states such as Bloch points and conical skyrmions are formed, and the structure of topological defects is determined by the magnitude and sign of the Dzyaloshinskii–Moriya constant. The influence of material parameters on the magnetization reversal processes and the stabilization of micromagnetic structures has been studied.

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V. V. Filippova

Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences

Email: zukhragzv@yandex.ru
Russian Federation, Ufa, 450075

Z. V. Gareeva

Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences

Author for correspondence.
Email: zukhragzv@yandex.ru
Russian Federation, Ufa, 450075

R. A. Doroshenko

Institute of Molecule and Crystal Physics, Subdivision of the Ufa Federal Research Centre of the Russian Academy of Sciences

Email: zukhragzv@yandex.ru
Russian Federation, Ufa, 450075

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2. Fig. 1. Hysteresis of magnetization in a magnetic field: red curve D3 = 0, blue curve — D3 = 2∙10−4 J/m2 (a), sequence of magnetic phases formed in the process of magnetization reversal (b), magnetic state — conical skyrmion with longitudinal (XOZ) and transverse (XOY) cuts (c).

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3. Fig. 2. Graph of the dependence mz(H) (a), sequence of magnetic phases formed during magnetization (b), morphology of the domain structure of the chiral layer in a magnetic field H||OZ, D3 = 8 10−4 J/m (c).

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