Volume 58, Number 5, June 2002
|Page(s)||771 - 777|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 May 2002|
Glauber slow dynamics of the magnetization in a molecular Ising chain
Dipartimento di Chimica, Università
degli Studi di Firenze Via della Lastruccia 5,
I-50019 Sesto Fiorentino (FI), Italy
2 Dipartimento di Fisica, Università degli Studi di Firenze Via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy
3 Istituto Nazionale per la Fisica della Materia, Unità di Firenze Via G. Sansone 1, I-50019 Sesto Fiorentino (FI), Italy
4 Istituto di Elettronica Quantistica, Consiglio Nazionale delle Ricerche Via Panciatichi 56/30, I-50127 Firenze, Italy
5 Instituto de Fisica, Universidade Federal do Rio de Janeiro CP68528, RJ 21945-970, Brazil
Accepted: 6 March 2002
The slow dynamics (10-6 s–104 s) of the magnetization in the paramagnetic phase, predicted by Glauber for the 1d Ising model, has been observed with ac susceptibility and SQUID magnetometry measurements in a molecular chain comprising alternating Co2+ spins and organic radical spins strongly antiferromagnetically coupled to give a 1d ferrimagnet. An Arrhenius behavior with activation energy K has been observed for ten decades of relaxation time and found to be consistent with the Glauber model. We have extended this model to take into account the ferrimagnetic nature of the chain as well as its helicoidal crystal structure.
PACS: 75.10.Hk – Classical spin models / 76.90.+d – Other topics in magnetic resonances and relaxations / 75.40.Gb – Dynamic properties (dynamic susceptibility, spin waves, spin diffusion, dynamic scaling, etc.)
© EDP Sciences, 2002
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