http://www.cnr.it/ontology/cnr/individuo/prodotto/ID32869
Relaxation time of the nanomagnet Fe4 (Articolo in rivista)
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- Relaxation time of the nanomagnet Fe4 (Articolo in rivista) (literal)
- Anno
- 2009-01-01T00:00:00+01:00 (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
- 10.1103/PhysRevB.79.104415 (literal)
- Alternative label
Rastelli E. ab; Tassi A. a (2009)
Relaxation time of the nanomagnet Fe4
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)
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- Rastelli E. ab; Tassi A. a (literal)
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- In: Physical Review B, vol. 79 (10) article n. 104415. American Physical Society, 2009. (literal)
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- ISI Web of Science (WOS) (literal)
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- a Univ Parma, Dipartimento Fis, I-43100 Parma, Italy;
b CNR, Ist IMEM, I-43100 Parma, Italy (literal)
- Titolo
- Relaxation time of the nanomagnet Fe4 (literal)
- Abstract
- The magnetic behaviour of the molecular nanomagnet Fe4 is very well simulated by a single spin model Hamiltonian in a crystal field with S=5. The crystal field parameters were determined from the inelastic neutron scattering (INS) spectra. Here we show that the quantum effects are crucial to understand the saturation of the relaxation time observed at very low temperature at variance with the standard master equation result that leads to an Arrhenius law at any temperature. Very deep downward spikes in correspondence of the anticrossing fields are found in the relaxation time versus field at low temperature. We compare our results with those obtained by previous approaches worked out to fit experimental data on Mn12. (literal)
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