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Laser controlled magnetism in hydrogenated fullerene films
Umeå University, Faculty of Science and Technology, Department of Physics.
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2011 (English)In: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 109, no 8, 083941-7 p.Article in journal (Refereed) Published
Abstract [en]

Room temperature ferromagnetic-like behavior in fullerene photopolymerized films treated with monatomic hydrogen is reported. The hydrogen treatment controllably varies the paramagnetic spin concentration and laser induced polymerization transforms the paramagnetic phase to a ferromagnetic-like one. Excess laser irradiation destroys magnetic ordering, presumably due to structural changes, which was continuously monitored by Raman spectroscopy. We suggest an interpretation of the data based on first-principles density-functional spin-unrestricted calculations which show that the excess spin from mono-atomic hydrogen is delocalized within the host fullerene and the laser-induced polymerization promotes spin exchange interaction and spin alignment in the polymerized phase.

Place, publisher, year, edition, pages
AIP , 2011. Vol. 109, no 8, 083941-7 p.
Keyword [en]
ab initio calculations, density functional theory, exchange interactions (electron), ferromagnetic materials, ferromagnetic-paramagnetic transitions, fullerenes, hydrogen, laser beam effects, magnetic thin films, paramagnetic materials, polymerisation, Raman spectra
Identifiers
URN: urn:nbn:se:umu:diva-43451DOI: 10.1063/1.3581105OAI: oai:DiVA.org:umu-43451DiVA: diva2:413955
Available from: 2011-05-01 Created: 2011-05-01 Last updated: 2017-12-11Bibliographically approved

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Makarova, Tatiana L.Shelankov, Andrei L.
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