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Magnetocaloric effect in Gd microwires
Russian version
DOI: 10.21883/PSS.2022.11.54199.424
Koplak O. V.1,2, Kashin S. N.1, Morgunov R. B.1,2,3, Korolev D. V.3, Zhidkov M. V.1, Piskorsky V. P.3, Valeev R. A.3
1Institute of Problems of Chemical Physics, Russian Academy of Sciences, Chernogolovka, Moscow oblast, Russia
2I.M. Sechenov First Moscow State Medical University, Moscow, Russia
3All-Russian Scientific Research Institute of Aviation Materials of the Research Center "Kurchatov Institute", Moscow, Russia
Email: o.koplak@gmail.com, SN.Kashin@yandex.ru, morgunov2005@yandex.ru, levis.k@mail.ru, zhidkov@icp.ac.ru, piskorskiyv@mail.ru, valeev-r-a@mail.ru
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In Gd microwires obtained by ultrafast cooling of the melt, a change in the magnetic entropy of 12 J/kg K was determined at a Curie temperature of 293 K in a magnetic field of 5 T. This value coincides with the change in the magnetic part of the entropy in bulk single-crystal samples in the same field. It has been found that in a strong magnetic field of 9 T, the temperature dependence of the entropy exhibits two maxima at temperatures of 292 and 312 K. The appearance of an additional entropy maximum in microstructured samples is caused by high mechanical microstresses retained in the sample after ultrafast cooling. Keywords: microwires, magnetic entropy, magnetoelastic anisotropy, Curie temperature.
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