Effect of zinc substitution on magneto-optical properties of Mn1−xZnxFe2O4/SiO2 nanocomposites

In this study, FeB x Fe 2-x O 4 nanoparticles (NPs) were synthesized by the polyol method. The M-H hysteresis curves exhibit superparamagnetic characteristics that are both coercivity and remanent magnetization values are negligible. The particle size dependent Langevin function was applied to calculate the magnetic particle dimensions around 9 nm. The measured magnetic moments of NPs are in range of (1.52-2.2) l B and almost half or less with respect to 4 l B of bulk Fe ferrite. Magnetic anisotropy was specified as uniaxial and calculated effective anisotropy constants (K eff ) are between 43.3 9 10 4 and 19.4 9 10 4 emu/g. The UV-Vis diffuse reflectance spectroscopy and Kubelka-Munk theory were used to determine the optical properties. The estimated optical band gap values (2.15-2.48 eV) of FeB x Fe 2-x O 4 NPs are bigger with respect to reported values (1.88-2.12 eV) for Fe 3 O 4 NPs in the literature. The bigger E g values are mainly attributed to B concentration and partly to quantum confinement effect.

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“…The magnetic hysteresis loop of samples in the superparamagnetic state is correlated with the size dependent Langevin function [36][37][38].…”

Section: Vsm Analysismentioning

confidence: 99%

Magneto Optical Properties of FeBxFe2−xO4 Nanoparticles

Amir

Geleri

Güner

et al. 2015

J Inorg Organomet Polym

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“…4. The equations for Langevin fit study were given in the previous reports of our research group [35][36][37][38]. The obtained Langevin fit parameters are statistical median (dm), the geometric standard deviation (Δ) and average magnetic particle diameter ( D mag ) of the SPION are given in Table 1.…”

Section: Vsm Analysismentioning

confidence: 99%

Preparation and characterization of SPION functionalized via caffeic acid

Baykal

Amir

Günerb

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…The related equations for theoretical fit studies were given in the previous reports of our research group [40][41][42][43]. The obtained Langevin fit parameters of statistical median (dm), the geometric standard deviation (Δ) and average magnetic particle diameter (D mag ) values of the superparamagnetic NPs are given in Table 1.…”

Section: Vsm Analysismentioning

confidence: 99%