Magnetic properties of conducting polymer doped with manganese-zinc ferrite nanoparticles

被引:58
作者
Poddar, P [1 ]
Wilson, JL
Srikanth, H
Morrison, SA
Carpenter, EE
机构
[1] Univ S Florida, Dept Phys, Phys Mat Lab, Tampa, FL 33620 USA
[2] USN, Res Lab, Washington, DC 20375 USA
关键词
D O I
10.1088/0957-4484/15/10/013
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
The magnetic properties of superparamagnetic particles are influenced by the supporting matrix. We have systematically studied the DC magnetic properties of loosely packed manganese-zinc ferrite (Mn0.68Zn0.25Fe2.07O3) nanoparticles synthesized using a reverse micelle technique. The results have been compared with those for particles suspended in paraffin wax and embedded in a polypyrrole matrix. The polypyrrole-doped particles were prepared using an in situ ultraviolet irradiation method and spin-coated into thin films. The loosely packed particles showed no resolvable coercivity even well below the blocking temperature. On the other hand, the same particles in wax showed the opening up of a large coercivity below the blocking temperature. However, both the samples showed characteristic superparamagnetic transition peaks in the temperature-dependent susceptibility nearly at the same temperature. The particles in the polypyrrole matrix showed a remarkable increase in the blocking temperature and large hysteresis at 300 K. The structural characterization of the polymer-doped sample showed clustering of the nanoparticles.
引用
收藏
页码:S570 / S574
页数:5
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