http://www.cnr.it/ontology/cnr/individuo/prodotto/ID57684

Finite-size effects on the dynamic susceptibility of CoPhOMe single-chain molecular magnets in presence of a static magnetic field (Articolo in rivista)

Type

Prodotto della ricerca (Classe)
Articolo in rivista (Classe)

Label

Finite-size effects on the dynamic susceptibility of CoPhOMe single-chain molecular magnets in presence of a static magnetic field (Articolo in rivista) (literal)

Anno

2011-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

10.1103/PhysRevB.84.094444 (literal)

Alternative label

M.G. Pini (1); A. Rettori (2); L. Bogani (3); A. Lascialfari (4,5); M. Mariani (4); A. Caneschi (6); R. Sessoli (6) (2011)
Finite-size effects on the dynamic susceptibility of CoPhOMe single-chain molecular magnets in presence of a static magnetic field
in Physical review. B, Condensed matter and materials physics; American Physical Society (APS), College Pk (Stati Uniti d'America)
(literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

M.G. Pini (1); A. Rettori (2); L. Bogani (3); A. Lascialfari (4,5); M. Mariani (4); A. Caneschi (6); R. Sessoli (6) (literal)

Pagina inizio

094444 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

http://link.aps.org/doi/10.1103/PhysRevB.84.094444 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

84 (literal)

Rivista

Physical review. B, Condensed matter and materials physics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

American Physical Society (APS). (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali

15 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

9 (literal)

Note

ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

1) Istituto dei Sistemi Complessi, Consiglio Nazionale delle Ricerche, I-50019 Sesto Fiorentino, Firenze, Italy 2) Dipartimento di Fisica and CNISM, Università di Firenze, I-50019 Sesto Fiorentino, Firenze, Italy 3) Physikalisches Institut, Universität Stuttgart, D-70550 Stuttgart, Germany 4) Dipartimento di Fisica A. Volta, Università di Pavia, I-27100 Pavia, Italy 5) Dipartimento di Scienze Molecolari Applicate ai Biosistemi, Università di Milano, I-20134 Milano, Italy 6) Dipartimento di Chimica and INSTM, Università di Firenze, I-50019 Sesto Fiorentino, Firenze, Italy (literal)

Titolo

Finite-size effects on the dynamic susceptibility of CoPhOMe single-chain molecular magnets in presence of a static magnetic field (literal)

Abstract

The static and dynamic properties of the single-chain molecular magnet Co(hfac)2NITPhOMe (CoPhOMe) (hfac = hexafluoroacetylacetonate, NITPhOMe = 4?-methoxy-phenyl-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide) are investigated in the framework of the Ising model with Glauber dynamics, in order to take into account both the effect of an applied magnetic field and a finite size of the chains. For static fields of moderate intensity and short chain lengths, the approximation of a monoexponential decay of the magnetization fluctuations is found to be valid at low temperatures; for strong fields and long chains, a multiexponential decay should rather be assumed. The effect of an oscillating magnetic field, with intensity much smaller than that of the static one, is included in the theory in order to obtain the dynamic susceptibility ?(?). We find that, for an open chain with N spins, ?(?) can be written as a weighted sum of N frequency contributions, with a sum rule relating the frequency weights to the static susceptibility of the chain. Very good agreement is found between the theoretical dynamic susceptibility and the ac susceptibility measured in moderate static fields (Hdc?2 kOe), where the approximation of a single dominating frequency for each segment length turns out to be valid. For static fields in this range, data for the relaxation time, ? versus Hdc, of the magnetization of CoPhOMe at low temperature are also qualitatively reproduced by theory, provided that finite-size effects are included. (literal)

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