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http://dx.doi.org/10.4283/JKMS.2010.20.5.196

Superparamagnetic Properties of γ-Fe2O3 Nanoparticles  

Lee, Seung-Wha (Department of Applied Physics, Konkuk University)
Lee, Jae-Gwang (Department of Applied Physics, Konkuk University)
Chae, Kwang-Pyo (Department of Applied Physics, Konkuk University)
An, Sung-Yong (LCR Division, Samsung Electro-Mechanics CO.)
Publication Information
Journal of the Korean Magnetics Society / v.20, no.5, 2010 , pp. 196-200 More about this Journal
Abstract
$\gamma-Fe_2O_3$ nanoparticles have been prepared by a sol-gel method. The structural and magnetic properties have been investigated by XRD, VSM and Mossbauer spectroscopy. $\gamma-Fe_2O_3$ powder annealed at $150^{\circ}C$ has a spinel structure and superparamagnetical behavior. The estimated size of superparammagnetic $\gamma-Fe_2O_3$ nanoparticle is around 7 nm. The hyperfine fields at $-261^{\circ}C$ for the A and B patterns were found to be 503 and 485 kOe, respectively. The blocking temperature ($T_B$) of superparammagnetic $\gamma-Fe_2O_3$ nanoparticle is about $-183^{\circ}C$. The magnetic anisotropy constant of $\gamma-Fe_2O_3$ nanoparticle was calculated to be $1.6{\times}10^6ergs/cm^3$. $\gamma-Fe_2O_3$ nanoparticle annealed at $150^{\circ}C$ can be a candidate for biomedicine applications as magnetic carriers.
Keywords
superparamagnetic; Mossbauer spectroscopy; nano-particle$\gamma-Fe_2O_3$;
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