Abstract
We report the polyvinylpyrrolidone (PVP) encapsulated MnZn ferrite (MnSUB0.8/SUBZnSUB0.2/SUBFe₂O₄/PVP) nanocomposite for low-temperature magnetic properties prepared by the facile one-pot sol-gel route. The transmission electron microscopy analysis revealed spherical shape ferrite particles in a polymer matrix MnSUB0.8/SUBZnSUB0.2/SUBFe₂O₄/PVP nanocomposite) with an average particle size of 11.6 nm. The Rietveld refinement of X-ray diffraction (XRD) data revealed the pure cubic spinel structure formation. The lattice parameter is 8.3825 Å, and the average crystallite size is 10 nm evaluated from XRD data. Raman spectroscopy analysis is in agreement with XRD results. The temperature-dependent magnetization analysis disclosed the effective anisotropy constant KSUBeff/SUB, the value of 3.0 × 10⁴ J/㎥. The meticulous investigation of magnetic field-dependent magnetic properties from 2 K to 350 K unveiled superparamagnetic (SPM) behavior. From the electron spin resonance (ESR) analysis, the calculated g value and spin-spin relaxation time (T₂) are 2.03 and 2.52 × 10SUP-11/SUP sec, respectively, which confirms the SPM behavior.
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