Unraveling the influence of donor defects on high-temperature ferromagnetism and dielectric properties in (Mn, Co) doped ZnO nanoparticles
Applied Physics A: Materials Science and Processing, ISSN: 1432-0630, Vol: 130, Issue: 7
2024
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Most Recent News
Findings in the Area of Nanoparticles Reported from University of Karachi [Unraveling the Influence of Donor Defects On High-temperature Ferromagnetism and Dielectric Properties In (Mn, Co) Doped Zno Nanoparticles]
2024 JUL 12 (NewsRx) -- By a News Reporter-Staff News Editor at Middle East Daily -- New research on Nanotechnology - Nanoparticles is the subject
Article Description
ZnO and Zn₀․₉₈Mn₀․₀₂CoₓO (0.00 ≤ x ≤ 0.025) nanoparticles were synthesized via the sol-gel method and subjected to a comprehensive analysis of their structural, electronic, morphological, dielectric, and magnetic properties. X-ray diffraction (XRD) confirmed the presence of a single-phase hexagonal ZnO structure, while transmission electron microscopy (TEM) revealed spherical particles with minor facets, consistent with high-resolution TEM (HR-TEM) data. X-ray photoemission spectroscopy (XPS) analysis demonstrated successful Co and Mn incorporation into the ZnO lattice without secondary phases. Dielectric properties were investigated via impedance spectroscopy, with results interpreted using the Maxwell-Wagner model to elucidate interfacial polarization mechanisms. Magnetic measurements revealed complex interactions in Mn-doped ZnO nanoparticles, including ferromagnetic, paramagnetic, and antiferromagnetic behaviors. However, the introduction of Co as a co-dopant stabilized the ferromagnetic moment in the (Zn, Mn)O system, attributed to the presence of sufficient oxygen vacancies. Notably, our findings provide strong evidence for defect-mediated ferromagnetism in (Mn, Co) co-doped ZnO nanoparticles, contributing to our understanding of magnetic phenomena in nanomaterials.
Bibliographic Details
Springer Science and Business Media LLC
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