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Interaction of Magnetization Centers of Different Signs as the Cause of the Nonmonotonic Field Dependence of the Domain Wall Velocity in Synthetic Pt/Co/Ir/Co/Pt Ferrimagnets

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Abstract

The purpose of the work is to find the dependence of growth rate of magnetization centers of various types on their surrounding by other nucleation centers in a synthetic Pt/Co/Ir/Co/Pt ferrimagnet with perpendicular magnetic anisotropy. The following four types of nucleation centers exist in a sample with two ferromagnetic layers of different thicknesses: P+ centers correspond to the regions where the magnetizations of the thick and thin Co layers are directed along an applied field (↑↑); P centers are the regions where the magnetizations of the layers are opposite to an applied field (↓↓); and AP+ and AP centers correspond to the regions where the magnetizations of the thick and thin Co layers are opposite to each other and the total magnetic moment is along (↑↓) or opposite to (↓↑) an applied field, respectively. P nucleation centers are found to be surrounded by AP+ regions in any field and exhibit a monotonic field dependence of their boundary. The field dependence of the growth rate of AP nucleation centers is nonmonotonic since, as the field increases, they are surrounded by AP+ nucleation centers, AP+ and P regions, and only P nucleation centers in strong fields.

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ACKNOWLEDGMENTS

We thank Y. Lu and A. Hamadeh for supplying the samples and useful discussions.

Funding

This work was supported by grant 3.1992.2017/4.6 in terms of the competition of scientific projects performed by scientific teams of research centers and/or laboratories in institutes of higher education, as well as under the project no. 5-100 “Elevating Competitiveness of Leading Russian Universities among Global Research and Education Centers.” The work of A.I.B. was supported by the Russian Foundation for Basic Research (project no. 19-32-90128, postgraduates).

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Correspondence to R. B. Morgunov.

Additional information

Translated by K. Shakhlevich

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Bezverkhnii, A.I., Talantsev, A.D., Mangin, S. et al. Interaction of Magnetization Centers of Different Signs as the Cause of the Nonmonotonic Field Dependence of the Domain Wall Velocity in Synthetic Pt/Co/Ir/Co/Pt Ferrimagnets. J. Exp. Theor. Phys. 129, 998–1004 (2019). https://doi.org/10.1134/S1063776119120021

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