Magnetic and magnetocaloric behaviors of a perovskite/hausmannite composite

• Published in: Current applied physics Vol. 60; pp. 57 - 63
• Main Authors: My, Kim T.H., Gayen, Anabil, Dang, N.T., Petrov, Dimitar N., Ćwik, J., Manh, T.V., Ho, T.A., Khan, D.T., Kim, D.-H., Yu, S.C., Phan, T.L.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-04-2024
• Subjects: Magnetic and magnetocaloric behaviors; Magnetic order; Manganite composite; Magnetic order; Manganite composite; Magnetic and magnetocaloric behaviors
• ISSN: 1567-1739; 1878-1675
• DOI: 10.1016/j.cap.2024.01.012

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.
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•Magnetic and magnetocaloric properties a perovskite/hausmannite composite.•Coexistence of the second-order transition and crossover behavior of first-/second-order transitions.•Large working temperature range from 40 to ∼85 K for nitrogen liquefication.•|ΔSmax| ≈ 3.1 J/kg.K, and RCP ≈ 150 J/kg for H = 30 kOe