The first family of rare-earth-based single chain magnets is presented. Compounds of general formula [M(hfac)(3)(NITPhOPh)], where M) Eu, Gd, Tb, Dy, Ho, Er, or Yb, and PhOPh is the nitronylnitroxide radical (2,4'-benzoxo-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), have been structurally characterized and found to be isostructural. The characterization of both static and dynamic magnetic properties of the whole family is reported. Dy, Tb, and Ho compounds display slow relaxation of the magnetization, and ac susceptibility shows a thermally activated regime with energy barriers of 69, 45, and 34 K for Dy, Tb, and Ho compounds, respectively, while only a frequency-dependent susceptibility is observed for Er below 2.0 K. In Gd and Yb derivatives, antiferromagnetic interactions dominate. The pre-exponential factors differ by about 4 orders of magnitude. Finite size effects, due to naturally occurring defects, affect the static and dynamic properties of the compounds differently.

A Family of Rare-Earth-Based Single Chain Magnets: Playing with Anisotropy / K. BERNOT; L. BOGANI; A. CANESCHI; D. GATTESCHI; R. SESSOLI. - In: JOURNAL OF THE AMERICAN CHEMICAL SOCIETY. - ISSN 0002-7863. - STAMPA. - 128:(2006), pp. 7947-7956. [10.1021/ja061101l]

A Family of Rare-Earth-Based Single Chain Magnets: Playing with Anisotropy

BOGANI, LAPO;CANESCHI, ANDREA;GATTESCHI, DANTE;SESSOLI, ROBERTA
2006

Abstract

The first family of rare-earth-based single chain magnets is presented. Compounds of general formula [M(hfac)(3)(NITPhOPh)], where M) Eu, Gd, Tb, Dy, Ho, Er, or Yb, and PhOPh is the nitronylnitroxide radical (2,4'-benzoxo-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide), have been structurally characterized and found to be isostructural. The characterization of both static and dynamic magnetic properties of the whole family is reported. Dy, Tb, and Ho compounds display slow relaxation of the magnetization, and ac susceptibility shows a thermally activated regime with energy barriers of 69, 45, and 34 K for Dy, Tb, and Ho compounds, respectively, while only a frequency-dependent susceptibility is observed for Er below 2.0 K. In Gd and Yb derivatives, antiferromagnetic interactions dominate. The pre-exponential factors differ by about 4 orders of magnitude. Finite size effects, due to naturally occurring defects, affect the static and dynamic properties of the compounds differently.
2006
128
7947
7956
K. BERNOT; L. BOGANI; A. CANESCHI; D. GATTESCHI; R. SESSOLI
File in questo prodotto:
File Dimensione Formato  
JACS2006_(AC1).pdf

Accesso chiuso

Tipologia: Versione finale referata (Postprint, Accepted manuscript)
Licenza: DRM non definito
Dimensione 361.94 kB
Formato Adobe PDF
361.94 kB Adobe PDF   Richiedi una copia

I documenti in FLORE sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/251139
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 491
  • ???jsp.display-item.citation.isi??? 490
social impact