Abstract
The effect of optical pumping and applied magnetic field on the characteristics of ferromagnetic layers in one-dimensional superlattices is studied. At low enough temperatures, these layers correspond to phase separation domains in RMn2O5 and R0.8Ce0.2Mn2O5 multiferroics. The formation of such domains occurs owing to the charge ordering of Mn3+ and Mn4+ ions and to the finite probability for eg electrons to tunnel between these pairs of ions. The volume occupied by such superlattices is rather small, and they can be treated as isolated ferromagnetic semiconductor heterostructures, spontaneously formed in the host crystal. The sequences of ferromagnetic resonances related to the superlattice layers in Eu0.8Ce0.2Mn2O5 are studied. The characteristics of these resonances give information on the properties of such layers. For the first time, it is demonstrated that the optical pumping gives rise to a new metastable state of superlattices, which can be recovered by the magnetic field cycling to the state existing before the optical pumping. It is found that the superlattices recovered by the magnetic field exist up to temperatures higher than those in as-grown crystals.
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Funding
This work was supported by the Russian Foundation for Basic Research (project no. 18-32-00241) and by the Presidium of the Russian Academy of Sciences (program 1.4 “Topical Problems of Low-Temperature Physics”).
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Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 12, pp. 826–832.
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Golovenchits, E.I., Khannanov, B.K. & Sanina, V.A. Effect of the Optical Pumping and Magnetic Field on the States of Phase Separation Domains in Eu0.8Ce0.2Mn2O5. Jetp Lett. 111, 709–714 (2020). https://doi.org/10.1134/S0021364020120073
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DOI: https://doi.org/10.1134/S0021364020120073