Magnetism of palladium clusters in nanoporous carbon |
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| Authors: | B D Shanina A M Danishevskii A I Veinger A A Sitnikova R N Kyutt A V Shchukarev and S K Gordeev |
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| Institution: | 1.Lashkarev Institute of Semiconductor Physics,National Academy of Sciences of Ukraine,Kiev,Ukraine;2.Ioffe Physicotechnical Institute,Russian Academy of Sciences,St. Petersburg,Russia;3.Department of Chemistry, Environmental and Biogeochemistry,Umee University,Umee,Sweden;4.Central Research Institute of Materials,St. Petersburg,Russia |
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| Abstract: | To determine the electronic properties of metal-carbon clusters, palladium clusters are introduced into nanoporous carbon
samples. The structural and magnetic properties of the nanocomposite thus obtained are investigated. A ferromagnetic resonance
(FMR) component is observed in the electron spin resonance (ESR) spectra measured in a wide temperature range. The electron
density of states (DOS) of clusters consisting of a palladium atom surrounded by carbon atoms is calculated, and it is shown
that, due to the interaction between electronic terms of carbon and metal, such a cluster should exhibit magnetism. The investigation
of the structures of the porous skeleton of nanoporous carbon and of palladium clusters has allowed us to reveal how carbon
and palladium atoms are brought into close contact so that to give rise to the observed ferromagnetism. |
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