Physics of the Solid State
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Critical indices of phase transitions and magnetic entropy in PrDyFeCoB microwires
Dvoretskaya A. B.
1,2, Kashin S.N.1, Valeev R.A.2, Kolmakov A. O.
1, Potapov M.V.
2, Piskorskii V. P.2, Morgunov R. B.
1,2,3
1Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry RAS, Сhernogolovka, Russia
2All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
3Tambov State Technical University, Tambov, Russia
2All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
3Tambov State Technical University, Tambov, Russia
Email: dvoretskaya95@yandex.ru, ao.kolmakov@gmail.com, 2148400@gmail.com
Microwires based on the PrDyFeCoB alloy in a field of 0-2 T are characterized by the presence of both positive and negative magnetocaloric effects (MCE) in the temperature ranges of 300-340 and 200-240 K, respectively. The low-temperature negative MCE is caused by the transition between the ferromagnetic and spin-glass states of the alloy, and the high-temperature MCE occurs during the spin-reorientation transition as a result of the competition between the shape anisotropy and volume anisotropy. The maximum relative cooling power was RCP = 0.007 J/g in a field of 2 T. The values of the obtained critical coefficients indicate that at the transition temperature to the spin-glass state, the spin ordering is two-dimensional, described by the Ising model. Keywords: polycrystalline microwires, rare earth alloys, magnetic entropy, magnetoelastic anisotropy, Curie temperature, magnetocaloric effect, critical indices.
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