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- Title
Femtosecond Optical and Magneto-Optical Spectroscopy Study of Magnetic and Electronic Inhomogeneities in a Pd<sub>0.94</sub>Fe<sub>0.06</sub> Thin Film.
- Authors
Petrov, A. V.; Yusupov, R. V.; Nikitin, S. I.; Gumarov, A. I.; Yanilkin, I. V.; Kiiamov, A. G.; Tagirov, L. R.
- 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 %.
- Subjects
OPTICAL spectroscopy; THIN films; MAGNETOOPTICS; DEMAGNETIZATION
- Publication
JETP Letters, 2019, Vol 110, Issue 3, p217
- ISSN
0021-3640
- Publication type
Article
- DOI
10.1134/S0021364019150104