| Autor: |
Kudryavtsev, Y. V., Uvarov, N. V., Klimov, V. V., Kozlova, L. E. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 9/14/2022, Vol. 132 Issue 10, p1-10, 10p |
| Abstrakt: |
Magnetic, transport, and optical properties of thin film and bulk Fe 2 CrGa alloy samples with different types of atomic order were experimentally investigated. The obtained data were discussed in terms of first-principle calculation results made for the stoichiometric Fe 2 CrGa alloy with different types of atomic order and disorder. An ultimate atomic disorder in Fe 2 CrGa alloy films was obtained by employing vapor quenching deposition onto substrates cooled by liquid nitrogen. Annealing of as-quenched Fe 2 CrGa alloy films causes their crystallization at T a n n = 750 K with the formation of the disordered A2-type structure, which is accompanied by the rapid growth of alloy resistivity in a narrow temperature range, formation of multi-phase magnetic structure and changes in the optical properties. Crystalline bulk and film Fe 2 CrGa alloy samples show the dome-like temperature dependence of the resistivity with maximums near their Curie temperatures and explained in terms of competition between negative with temperature contribution from highly resistive media and positive from the electron–magnon scattering. The big resemblance between calculated for Hg 2 CuTi type of atomic order and experimental optical conductivity spectra for annealed Fe 2 CrGa alloy films proves that Hg 2 CuTi type of atomic order is more probable for this alloy. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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