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Article

Curr. Appl. Phys. 2024; 60: 57-63

Published online April 30, 2024 https://doi.org/10.1016/j.cap.2024.01.012

Copyright © The Korean Physical Society.

Magnetic and magnetocaloric behaviors of a perovskite/hausmannite composite

Faculty of Physics Engineering and Nanotechnology, VNU University of Engineering and Technology, Vietnam National University, Hanoi, 100000, Viet Nam; Department of Physics, Chungbuk National University, Cheongju, 28644, South Korea; Institute of Research and Development, Duy Tan University, Da Nang, 550000, Viet Nam; Faculty of Environmental and Natural Sciences, Duy Tan University, Danang, 550000, Viet Nam; Department of Physical Chemistry, Plovdiv University “Paisii Hilendarski”, 24 Tzar Asen Str., Plovdiv, 4000, Bulgaria; Institute of Low Temperature and Structure Research, PAS, Wroclaw, 50-950, Poland; Phenikaa University Nano Institute (PHENA), PHENIKAA University, Hanoi, 12116, Viet Nam; University of Science and Education, The University of Danang, Danang, 550000, Viet Nam; Department of Physics, Ulsan National Institute of Science and Technology, Ulsan, 44919, South Korea

Abstract

We present here a detailed study on the magnetic and magnetocaloric (MC) behaviors of a perovskite/hausmannite composite material of LYCMO/Mn3O4, where LYCMO (La0.5Y0.1Ca0.4MnO3) is a primary phase of 95 wt%. The analysis of M(T) data indicates a coexistence of ferromagnetic-paramagnetic transitions associated with LYCMO and Mn3O4 at about 56 and 43 K, respectively. Critical-behavior analyses have proved the composite exhibiting a second-order phase transition at magnetic fields H ≤ 10 kOe, with critical exponents β = 0.347 and γ = 1.167 characteristic of 3D-Heisenberg and 3D-Ising ferromagnets, respectively. At higher fields, it tends to exhibit crossover behaviors of first-/second-order transitions. As analyzing the MC effect upon isothermal M(H) data, we have found the maximum magnetic-entropy change of ∼3.1 J/kg⋅K, and the relative refrigerant capacity (RCP) of ∼150 J/kg for H = 30 kOe, which are higher than those obtained for other oxides in the same temperature and applied-magnetic ranges. With the absence of hysteresis loop and large RCP value, this material can be used in magnetic-cooling devices working at temperatures T = 40∼85 K to liquefy nitrogen. © 2024 Korean Physical Society

Keywords: Magnetic and magnetocaloric behaviors, Magnetic order, Manganite composite

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