Comparison of isothermal and adiabatic magnetocaloric effects in Gd films and microwires
Kashin S. N.1, Morgunov R. B.1,2,3, Valeev R. A.3, Piskorsri V. P.3, Burkanov M. V.3, Korolev D. V.1, Korolev V. V.4, Balmasova O. V.4
1Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
2Tambov State Technical University, Tambov, Russia
3All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
4G.A. Krestov Institute of Solution Chemistry of the Russian Academy of Sciences, Ivanovo, Russia
Email: spintronics2022@yandex.ru
A comparative analysis of the temperature and field dependences of the magnetization of Gd films and microwires was carried out, as well as an analysis of isothermal and adiabatic changes in the magnetic part of the entropy and heat capacity at temperatures close to the Curie temperature. The magnetocaloric effect in microwires exhibits two peaks at ~290 and ~320 K in the temperature dependence of the magnetic part of the entropy, in contrast to one peak in films. In films and microwires, the entropy maximum at ~290 K depends on the magnetic field, shifting equally in films and microwires with increasing field. In microwires, the second maximum at ~320 K does not change its position as the field increases to 9 T, but its amplitude increases linearly with increasing field. This maximum is due to a spin-reorientation transition in the phase with an increased Curie temperature. Keywords: microwires, thin films, magnetic entropy, magnetic anisotropy, spin-reorientation transition, Curie temperature.
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