Magnetocaloric Study of La0.45Nd0.25Sr0.3MnO₃/MO (MO = CuO, CoO, and NiO) Nanocomposites

• Published in: IEEE transactions on magnetics Vol. 58; no. 2; pp. 1 - 8
• Main Authors: Neupane, Dipesh, Hulsebosch, Liam, Pathak, Arjun K., Mishra, Sanjay R.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.02.2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Autocombustion; Copper oxides; magnetic isotherms; Magnetic measurement; Magnetic properties; Magnetism; Magnetization curves; magnetocaloric; Metals; Nanocomposites; Nickel oxides; Phase transitions; Powders; Room temperature; Temperature dependence; Temperature measurement; Transition metal oxides; X ray powder diffraction; X-ray diffraction; X-ray scattering
• ISSN: 0018-9464; 1941-0069
• DOI: 10.1109/TMAG.2021.3087108

The influence of transition metal oxide (MO) on the structural, magnetic, and magnetocaloric properties for La 0.45 Nd 0.25 Sr 0.3 MnO 3 (LSMO)/<inline-formula> <tex-math notation="LaTeX">x </tex-math></inline-formula>-wt.% MO (MO = CuO, CoO and NiO) nanocomposite samples has been investigated using X-ray powder diffraction (XRD) and magnetic measurements. Pure phase nanocomposites were prepared via the one-pot autocombustion method. The XRD patterns of the composite reveal the presence of a distinct pure phase of LSMO and MOs. Temperature-dependent field-cooled magnetization curve exhibits second-order phase transition near room temperature. The isothermal magnetic entropy change (<inline-formula> <tex-math notation="LaTeX">\Delta S_{M} </tex-math></inline-formula>) is calculated from magnetic isotherms. LSMO-2.5 wt.% CuO composite-display <inline-formula> <tex-math notation="LaTeX">\Delta S_{M}\sim -3.95 </tex-math></inline-formula> J/kg<inline-formula> <tex-math notation="LaTeX">\cdot \text{K} </tex-math></inline-formula>, highest among studied composites, which is 110% higher than LSMO. While the relative cooling power (RCP) values were observed to be maximum for 5 wt.% CoO composite.