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Femtosecond Optical and Magneto-Optical Spectroscopy Study of Magnetic and Electronic Inhomogeneities in a Pd0.94Fe0.06 Thin Film

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Abstract

The results of a femtosecond optical and magneto-optical spectroscopy study of a thin epitaxial film of a low-temperature magnetically soft Pd0.94Fe0.06 alloy on a ({dy001})-MgO substrate are reported. The photoinduced demagnetization and magnetization recovery times are determined. The latter increases critically at approaching the ferromagnetic ordering temperature TC = 190 K from below. It is shown that the reflectivity dynamics after a photoexcitation pulse evolves from a two-exponential in the paramagnetic phase to a four-component at 80 K < T < TC, simplifying to a three-component at T < 50 K. According to our interpretation, such an evolution, along with the manifestation of an additional increasing component in the magnetic response at 80 K < T < TC, indicates a magnetic and electronic inhomogeneity of the film associated with the distribution of local iron concentrations. The fraction of small-scale inclusions of the paramagnetic phase is estimated as ≈10 vol %.

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Funding

This work was supported by the Russian Science Foundation (project no. 18-12-00459). R.V. Yusupov acknowledges the support of the subsidy allocated to the Kazan Federal University for the state assignment in the sphere of scientific activities (project no. 3.8138.2017/8.9).

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Authors and Affiliations

  1. Kazan Federal University, Kazan, 420008, Russia

    A. V. Petrov, R. V. Yusupov, S. I. Nikitin, A. I. Gumarov, I. V. Yanilkin, A. G. Kiiamov & L. R. Tagirov

  2. Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center, Russian Academy of Sciences, Kazan, 420029, Russia

    L. R. Tagirov

Authors
  1. A. V. Petrov
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  2. R. V. Yusupov
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  3. S. I. Nikitin
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  4. A. I. Gumarov
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  5. I. V. Yanilkin
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  6. A. G. Kiiamov
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  7. L. R. Tagirov
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Corresponding author

Correspondence to R. V. Yusupov.

Additional information

Russian Text © The Author(s), 2019, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2019, Vol. 110, No. 3, pp. 197–203.

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Petrov, A.V., Yusupov, R.V., Nikitin, S.I. et al. Femtosecond Optical and Magneto-Optical Spectroscopy Study of Magnetic and Electronic Inhomogeneities in a Pd0.94Fe0.06 Thin Film. Jetp Lett. 110, 217–222 (2019). https://doi.org/10.1134/S0021364019150104

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  • DOI: https://doi.org/10.1134/S0021364019150104

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