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Characteristics of magnetism in nanoporous carbon with palladium clusters
Umeå University, Faculty of Science and Technology, Department of Physics.
2011 (English)In: Physics of the solid state, ISSN 1063-7834, E-ISSN 1090-6460, Vol. 53, no 5, 1017-1024 p.Article in journal (Refereed) Published
Abstract [en]

The magnetic properties of samples of nanoporous carbon with palladium clusters prepared from polycrystalline SiC have been studied over a wide range of temperatures. The specific magnetic moment rapidly decreases with increasing temperature. The obtained experimental magnetization curves have a nonlinear character but do not reach saturation even in a field of 10 kOe. Being constructed as functions of H/T, they lie on a universal curve, which suggests superparamagnetism of the system. The experimental curves have a hysteresis. The coercive force, first, decreases with increasing temperature and, then (in the range of 5–20 K), increases, thus forming a notch singularity. On the contrary, the residual magnetization rapidly decreases with increasing temperature. A conclusion on the prevailing contribution of superparamagnetic clusters to the magnetic subsystem is made.

Place, publisher, year, edition, pages
2011. Vol. 53, no 5, 1017-1024 p.
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Condensed Matter Physics
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URN: urn:nbn:se:umu:diva-39643DOI: 10.1134/S1063783411050076OAI: oai:DiVA.org:umu-39643DiVA: diva2:394594
Available from: 2011-02-03 Created: 2011-02-03 Last updated: 2017-12-11Bibliographically approved

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Makarova, Tatiana

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