Structure-based magneto-dielectric response in Zn and V Co-doped NiFe2O4 for magnetic and spintronic applications
Year: 2025
Type: article
Abstract: This study implemented the sol-gel method to synthesize NiFe 2 O 4 (NFO) and Ni 0.6 Zn 0.4 Fe 1.94 V 0.06 O 4 (NZFVO) nanoparticles. X-ray diffraction (XRD) with Rietveld refinement confirmed cubic spinel structures, while FESEM and TEM showed that dopants caused lattice distortion, leading to larger grains and crystallites in NZFVO. First-principles calculations show a reduced direct bandgap and conduction band splitting in NZFVO, attributed to strong d–p orbital hybridization. Mulliken population analysis indicates off-center cationic displacements and increased covalency, further supporting the observed dielectric and magnetic behavior. Dielectric measurements confirmed lower permittivity and loss in NZFVO, indicating its suitability for low-loss spintronic devices. Magnetic characterization shows enhanced saturation magnetization, lower coercivity, and reduced Curie temperature ( T c ) in NZFVO, resulting from optimized cation distribution and weakened anisotropy. Therefore, NZFVO, with high saturation magnetization (∼72.4 emu/g) and low coercivity (∼6.6 Oe), is well-suited for low-field detection, magnetic biosensing, and room-temperature sensing. Its reduced bandgap and strong d-p hybridization enable spin-dependent conduction, while moderate conductivity and low resistivity make it a promising channel material for spin-based transistors and logic devices.
Source: Surfaces and Interfaces
Authors: Md. Sarowar Hossain, Sagar Dutta, Md. Rabiul Hassan, Ejaj Tarif, M.D.I. Bhuyan, Angkita Mistry Tama, M.D. Hossain, Gourab Kumar Roy
Language: English
Subfield: Materials Chemistry
Field: Materials Science
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $2,670
OpenAlex ID: W4413905015