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Laser controlled ma...
Laser controlled magnetism in hydrogenated fullerene films
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- Makarova, Tatiana L., 1959- (författare)
- Umeå universitet,Institutionen för fysik
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Kvyatkovskii, Oleg E. (författare)
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Zakharova, Irina B. (författare)
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Buga, Sergei G. (författare)
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Voklov, Aleksandr P. (författare)
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- Shelankov, Andrei L., 1946- (författare)
- Umeå universitet,Institutionen för fysik
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(creator_code:org_t)
- AIP, 2011
- 2011
- Engelska.
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Ingår i: Journal of Applied Physics. - : AIP. - 0021-8979 .- 1089-7550. ; 109:8, s. 083941-7
- Relaterad länk:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- 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.
Nyckelord
- 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
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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