PROCESSING AND PROPERTIES OF COMPOSITE MAGNETIC POWDERS CONTAINING Co NANOPARTICLES IN POLYMERIC MATRIX

Ewa Sówka 2Marcin Leonowicz 2Bartłomiej Andrzejewski 1Anatolii D. Pomogailo 3Gulzhian I. Dzhardimalieva 3

1. Polish Academy of Sciences, Institute of Molecular Physics, Mariana Smoluchowskiego 17, Poznań 60-179, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
3. Russian Academy of Sciences, Institute of Problems of Chemical Physics (IPCP RAS), Institutskii pr., 18, Chernogolovka 142432, Russian Federation

Abstract

Polymeric matrix ferromagnetic nanocomposites, containing Co nanocrystallites were processed by an innovative fabrication method using frontal polymerisation of cobalt acrylamid complex (CoAAm), followed by further thermolysis. The products of thermolysis were in a form of irregular powder particles having broad range of size distribution, from 10 up to 300 mm. The powder particles contain nanocrystallites of Co having the mean 12 -15 nm, depending on the thermolysis temperature. The particles are randomly distributed and their size and agglomeration can be controlled by the processing variables.
The hysteresis loops recorded for materials processed at 873 and 1073 K, respectively proved that the coercivity depends on the processing temperature and very slightly on the measurement temperature. According to the commonly approved classification the coercivity of the composite material processed at temperatures 873 and 1073 K can be regarded as magnetically soft and hard, respectively.

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Presentation: poster at E-MRS Fall Meeting 2005, Symposium B, by Ewa Sówka
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-08-11 08:44
Revised:   2009-06-07 00:44
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