| 1. |
- Kvyatkovskii, Oleg E, et al.
(författare)
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Magnetic properties of polymerized fullerene doped with hydrogen, fluorine and oxygen
- 2006
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Ingår i: Fullerenes, nanotubes, and carbon nanostructures. - Philadelphia : Taylor & Francis. - 1536-383X .- 1536-4046. ; 14:2-3, s. 385-389
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Tidskriftsartikel (refereegranskat)abstract
- We have presented recently a mechanism of ferromagnetism in polymeric fullerene phases based on spin and charge transfer from nonmagnetic donor or acceptor centers into fullerene molecules. In this work, the interaction between magnetic moments of the paramagnetic C60R radical adducts (R = H, F, OH) dispersed in the 2D polymeric network is examined by using UB3LYP hybrid density functional method at 3-21G level. The results show that the interaction is ferromagnetic, strong and long-range.
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| 2. |
- Kvyatkovskii, Oleg E, et al.
(författare)
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Magnetic transition in the polymerized fullerene matrix
- 2006
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Ingår i: Fullerenes, Nanotubes and Carbon Nanostructures vol. 14, issue 2&3. - : Taylor & Francis. ; , s. 373-380
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Konferensbidrag (refereegranskat)abstract
- A mechanism of the ferromagnetism in the polymerized fullerene phase is proposed. We show that non‐magnetic defects and impurities give rise to a magnetic transition in the polymerized fullerene matrix. In our model, C60 molecules acquire spin and charge and become magnetically active due to the spin and charge transfer from non‐magnetic dopants. The interaction between magnetic moments of the arising paramagnetic species (C60 ± ions or C60 R radical adducts) dispersed in the polymeric network is inspected by using ab initio Hartree‐Fock and B3LYP hybrid density functional methods. It is revealed that the interaction is ferromagnetic and large enough for creating the high‐T c magnetism.
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| 3. |
- Makarova, Tatiana L., 1959-, et al.
(författare)
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Laser controlled magnetism in hydrogenated fullerene films
- 2011
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Ingår i: Journal of Applied Physics. - : AIP. - 0021-8979 .- 1089-7550. ; 109:8, s. 083941-7
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Tidskriftsartikel (refereegranskat)abstract
- 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.
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