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Magnetic-field induced multi-step transitions in ferromagnetic spin-crossover solids within the BEG model

Author

Listed:
  • T. D. Oke

    (Université d’Abomey-Calavi
    Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS)

  • M. Ndiaye

    (Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS)

  • F. Hontinfinde

    (Université d’Abomey-Calavi)

  • K. Boukheddaden

    (Université Paris-Saclay, Université de Versailles/St. Quentin en Yvelines-CNRS)

Abstract

We study by means of the 2D Blume–Emery–Griffiths (BEG) spin-1 model, spin-crossover (SCO) and prussian blue analogs (PBAs) solids. In this model, the spin states, which can be high-spin (HS) or low-spin (LS), interact magnetically and elastically with their nearest neighbors. To account for the volume change, accompanying the spin transition phenomenon, all interactions through the lattice are assumed as temperature-dependent. In addition, the system is subject to a variable magnetic field lifting the degeneracy in the HS state. A stochastic cooperative dynamics of this BEG-like Hamiltonian, describing the equilibrium and nonequilibrium properties of ferromagnetic spin-crossover solids, is derived from the Glauber approach, with appropriate Arrhenius microscopic transition rates. The model generates under the magnetic field, sigmoidal relaxation and a hysteresis phenomenon of the HS fraction, as well as multistep behavior of the magnetization. These behaviors open the way to new route of multi-stable systems, desired in multi-byte electronics. Graphic Abstract

Suggested Citation

  • T. D. Oke & M. Ndiaye & F. Hontinfinde & K. Boukheddaden, 2021. "Magnetic-field induced multi-step transitions in ferromagnetic spin-crossover solids within the BEG model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 94(1), pages 1-11, January.
    • Handle: RePEc:spr:eurphb:v:94:y:2021:i:1:d:10.1140_epjb_s10051-020-00027-1
    DOI: 10.1140/epjb/s10051-020-00027-1
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