Enhancement in magnetic and magnetocaloric properties of CoFe$_2$O$_4$ nanofibers at lower temperatures

Elmouloua, Salma (author), Hadouch, Youness (author), Ayadh, Salma (author), Touili, Salma (author), Mezzane, Daoud (author), Amjoud, M'barek (author), Moumen, Said Ben (author), Alimoussa, Abdelhadi (author), Lahmar, Abdelilah (author), Jagličić, Zvonko (author), Kutnjak, Zdravko (author), El Marssi, Mimoun (author)

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.

• Language: English
• Keywords: cobalt ferrite, sol–gel, electrospinning, nanofibers, magnetocaloric effect, relative cooling power
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 7794-7804
• Numbering: Vol. 53, iss. 12
• PID: 20.500.12556/RUL-165878
• UDC: 539
• ISSN on article: 1543-186X
• DOI: 10.1007/s11664-024-11459-1
• COBISS.SI-ID: 218389251
• Publication date in RUL: 12.12.2024

Record is a part of a journal

• Title: Journal of electronic materials
• Shortened title: J. electron. mater.
• Publisher: Springer Nature, The Minerals, Metals & Materials Society
• ISSN: 1543-186X
• COBISS.SI-ID: 513689625

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: kobaltov ferit, feromagnetizem, nanovlakna

Projects

• Funder: EC - European Commission
• Funding programme: HE
• Project number: 101130520
• Name: Innovative Functional Oxide Materials for Green Hydrogen Energy Production
• Acronym: H-GREEN

• Funder: EC - European Commission
• Funding programme: H2020
• Project number: 872631
• Name: Memristive and multiferroic materials for emergent logic units in nanoelectronics
• Acronym: MELON