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Conditions for the Occurrence of Spontaneous Oscillating Magnetic Relaxation in Synthetic Pt/Co/Ir/Co/Pt Ferrimagnets

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Abstract

It has been established that nonmonotonic magnetization relaxation in Pt/Co/Ir/Co/Pt synthetic ferrimagnets (SF) with perpendicular magnetic anisotropy is caused by the coincidence of two or three switching fields between stable states of the SF magnetization (double or triple point). The fields of switching between the stable states of SFs are determined by the ratio of the Zeeman energy, interlayer exchange energy, and the energies of magnetization reversal barriers of each layer, depending on the thickness of the layers and temperature. It has been shown that the selection of thickness and/or temperature enables reaching double and triple points at which the transition fields between the states coincide, which causes a nonmonotonic magnetic relaxation of SFs.

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ACKNOWLEDGMENTS

The authors thank Prof. S Mangin (Institute Jean Lamour, Universite de Lorraine, Nancy, France) for providing samples and fruitful discussions.

Funding

This work was supported by grant no. 3.1992.2017/4.6 as part of a competition of scientific projects carried out by the research teams of research centers and (or) scientific laboratories of higher education of educational organizations, and the Russian Foundation for Basic Research (A.I. Bez-verkhnii), project no. 19-32-90128 (within the program Top5-100).

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Authors and Affiliations

  1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Russia

    R. B. Morgunov, A. I. Bezverkhnii & M. V. Bakhmet’ev

  2. Tambov Technical State University, Tambov, Russia

    R. B. Morgunov, A. I. Bezverkhnii & O. S. Dmitriev

  3. Sechenov University of the Ministry of Health of Russia (First MGMU), Moscow, Russia

    R. B. Morgunov

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  1. R. B. Morgunov
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  2. A. I. Bezverkhnii
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  3. O. S. Dmitriev
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  4. M. V. Bakhmet’ev
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Correspondence to R. B. Morgunov.

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Translated by G. Dedkov

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Morgunov, R.B., Bezverkhnii, A.I., Dmitriev, O.S. et al. Conditions for the Occurrence of Spontaneous Oscillating Magnetic Relaxation in Synthetic Pt/Co/Ir/Co/Pt Ferrimagnets. Phys. Solid State 62, 458–463 (2020). https://doi.org/10.1134/S1063783420030142

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