20.500.12556/RUL-165878 Enhancement in magnetic and magnetocaloric properties of CoFe$_2$O$_4$ nanofibers at lower temperatures This research paper investigates new and first insights into the magnetic and magnetocaloric properties of one-dimensional (1D) cobalt ferrite CoFe$_2$O$_4$ (CFO) nanofibers (NFs) fabricated using a sol–gel-based electrospinning technique, focusing in particular on their behavior at low temperatures for specific applications. The microstructural, structural, magnetic, and magnetocaloric properties of the calcined CFO NFs were explored. The microstructure of the NFs, with an average diameter of 210 nm, was examined by scanning and transmission electron microscopy (SEM, TEM). The x-ray diffraction (XRD) of the CFO NFs showed a pure cubic close-packed (ccp) spinel crystalline structure with the Fd$\overline {3}$m space group. The Raman spectroscopic studies further confirm the cubic inverse spinel phase. The magnetic properties were explored as a function of temperature, ranging from 10 K to 300 K, and ferromagnetic behavior was observed with the highest saturation magnetization of 75.87 emu/g and coercivity of 723 Oe at room temperature. The variation of the magnetic entropy was measured indirectly using the Maxwell approach with an increasing magnetic field. A maximum of |ΔS| = 1.71 J/K was reached around 32 K. At 180 K, the associated adiabatic temperature change, ΔT$_{max}$, was 0.93 K, with a large RCP value of 7.58 J/kg, which is reasonably high for the corresponding nanoparticles (NPs). This work suggests that 1D CFO NFs offer a promising route for the production of nanostructured magnetic materials, potentially impacting various electronic and electromagnetic device applications at low temperatures. cobalt ferrite sol–gel electrospinning nanofibers magnetocaloric effect relative cooling power kobaltov ferit feromagnetizem nanovlakna true false true Angleški jezik Slovenski jezik Članek v reviji 2024-12-12 14:05:15 2024-12-12 14:05:21 2024-12-13 03:57:49 0000-00-00 00:00:00 2024 0 0 Str. 7794-7804 iss. 12 Vol. 53 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 539 1543-186X 10.1007/s11664-024-11459-1 218389251 s11664-024-11459-1.pdf s11664-024-11459-1.pdf 1 7D05DB03F948B578B1B7E1D28A0716F2 86aa8f45f7e443c6cdb061a5da1b135a84446374d132b4f26b310e57b45d9149 bbfca33d-b889-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=197147 https://link.springer.com/article/10.1007/s11664-024-11459-1 0 9845e12d-b889-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=197146 Fakulteta za gradbeništvo in geodezijo 0 0 0