Investigation of structural, electrical, and magnetic anisotropy studies of the rare earth (Tb3+) ion substituted Mg-Ni nanocrystalline ferrites for spintronic applications

Investigation of structural, electrical, and magnetic anisotropy studies of the rare earth (Tb3+) ion substituted Mg-Ni nanocrystalline ferrites for spintronic applications

Tb3+ ion-doped Mg-Ni nanocrystalline ferrites with the chemical formula Mg0.2Ni0.8TbxFe2-xO4 (x = 0.00 to 0.25) were synthesized using the sol-gel auto-combustion method. The structural properties of all samples were analyzed using X-ray diffraction, FTIR, and UV–visible spectroscopy. XRD studies co...

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Bibliographic Details
Main Authors: Jettiboyina Anjaneyulu, K.V. Ramesh, D. Venkatesh, Bimaleswar Sahu
Format: Article
Language:English
Published: Elsevier 2025-12-01
Series:Physics Open
Subjects:
Nano ferrite
Sol-gel method
Structural and UV–Visible
VSM
DC conductivity
Magnetic properties
Online Access:http://www.sciencedirect.com/science/article/pii/S2666032625000584
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Summary:Tb3+ ion-doped Mg-Ni nanocrystalline ferrites with the chemical formula Mg0.2Ni0.8TbxFe2-xO4 (x = 0.00 to 0.25) were synthesized using the sol-gel auto-combustion method. The structural properties of all samples were analyzed using X-ray diffraction, FTIR, and UV–visible spectroscopy. XRD studies confirmed the existence of a secondary phase in samples with x = 0.15 to higher concentrations. The lattice constant decreased, and the X-ray density increased with increasing Tb3+ ions. The two prominent absorption bands observed in the FTIR spectra confirmed the spinel structure. The direct band gap obtained from the UV–vis investigation was in the range of 1.85–1.67 eV, confirming semiconducting behavior. The grain size calculated using FESEM increased with increasing Tb3+ concentration. DC electrical conductivity measurements also indicated the semiconducting characteristics of the samples. Magnetic measurements were performed using VSM. The addition of Tb3+ ions resulted in a decrease in the saturation magnetization from 29.32 (x = 0.00) to 8.61 (x = 0.25) emu/g. In addition, the anisotropy constant and anisotropy field decreased with increasing Tb3+ ion content because of secondary phase formation. Tunable magnetic softening, semiconducting nature, and anisotropy control are essential for tailoring materials for spintronic applications.
ISSN:2666-0326

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