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http://dx.doi.org/10.4283/JKMS.2006.16.1.040

Superparamagnetic Properties off Zn0.5Ni0.5Fe2O4 Nanoparticles  

Lee, Seung-Wha (Department of Electronic Engineering, Chungju National University)
Publication Information
Journal of the Korean Magnetics Society / v.16, no.1, 2006 , pp. 40-44 More about this Journal
Abstract
[ $Zn_{0.5}Ni_{0.5}Fe_2O_4$ ] nanoparticles have been prepared by a sol-gel method. The structural and magnetic properties have been investigated by XRD, SEM, and Mossbauer spectroscopy, VSM. $Zn_{0.5}Ni_{0.5}Fe_2O_4$ powder that was annealed at $300^{\circ}C$ has spinel structure and behaved superparamagnetically at room temperature. The estimated size of superparammagnetic $Zn_{0.5}Ni_{0.5}Fe_2O_4$ nanoparticle is around 7 nm. The hyperfine fields of the A and I patterns at 4.2 K were found to be 510 and 475 kOe, respectively. The blocking temperature $(T_B)$ of superparammagnetic $Zn_{0.5}Ni_{0.5}Fe_2O_4$ nanoparticle is about 90 K. The magnetic anisotropy constant and relaxation time constant of $Zn_{0.5}Ni_{0.5}Fe_2O_4$ nanoparticle were calculated to be $K=1.6\times10^6erg/cm^3$.
Keywords
superparamagnetic; Mossbauer spectroscopy; sol-gel method;
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