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Controlled magnetic properties of Ni nanoparticles embedded in polyimide films
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Materials Science, Materials Physics.
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2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 76, no 17, 174432- p.Article in journal (Refereed) Published
Abstract [en]

We have studied the magnetic properties of Ni nanoparticles incorporated in polyimide films using dc- and ac-magnetization measurements. Transmission electron microscopy images reveal that both the mean particle diameter (dave) and the volume fraction of particles (ηave) in the composite layer can be controlled independently. In a series of samples with fixed dave, the system with the lowest ηave behaves magnetically as an ensemble of noninteracting superparamagnets. With increasing ηave, typical signatures of the dipole-dipole interparticle interaction, such as an enhanced blocking temperature, are observed. In dense systems, with a particle concentration above the threshold for geometrical percolation, the magnetic response is ferromagnetic due to the exchange interaction between particles in direct contact.

Place, publisher, year, edition, pages
2007. Vol. 76, no 17, 174432- p.
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Physical Sciences
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URN: urn:nbn:se:uu:diva-15096DOI: 10.1103/PhysRevB.76.174432OAI: oai:DiVA.org:uu-15096DiVA: diva2:42867
Available from: 2008-05-27 Created: 2008-05-27 Last updated: 2017-12-11Bibliographically approved

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Jönsson, Petra

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