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No.1(pp.1-39)

Home > Issues > Volume 10 (2005) > No.1(pp.1-39)

Superparamagnetic Properties of Nanoparticles Ni_0.9Zn_0.1Fe₂O₄for Biomedical Applications

Journal of Magnetics, Volume 10, Number 1, 31 Mar 2005, Pages 5-9

Seung Wha Lee(Department of Electronic Engineering Chungju National University), Chul Sung Kim*

(Department of Physics, Kookmin University)

Abstract

Nanoparticles Ni_0.9Zn_0.1Fe₂O₄is fabricated by a sol-gel method. The magnetic and structural properties of powders were investigated with XRD, SEM, Mossbauer spectroscopy, and VSM. Ni_0.9Zn_0.1Fe₂O₄ powders annealed at 300℃ have a spinel structure and behaved superparamagnetically. The estimated size of Ni_0.9Zn_0.1Fe₂O₄nanoparticle is about 10 nm. The hyperfine fields at 13 K for the A and B patterns are found to be 533 and 507 kOe, respectively. The ZFC curves are rounded at the blocking temperature (T_B) and show a paramagnetic-like behavior above T_B.T_B of Ni_0.9Zn_0.1Fe₂O₄nanoparticle is about 250 K. Nanoparticles Ni_0.9Zn_0.1Fe₂O₄annealed at 400 and 500℃ have a typical spinel structure and is ferrimagnetic in nature. The isomer shifts indicate that the iron ions were ferric at the tetrahedral (A) and the octahedral (B). The saturation magnetization of nanoparticles Ni_0.9Zn_0.1Fe₂O₄annealed at 400 and 500℃ are 40 and 43 emu/g, respectively. The magnetic anisotropy constant of Ni_0.9Zn_0.1Fe₂O₄annealed at 300℃ were calculated to be 1.6×10⁶ ergs/㎤

Keywords: Superparamagnetism; Nanoparticle; Mossbauer; Applications in Biomedicine

DOI:

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