MAGNETIC-RELAXATION IN BIG MAGNETIC MOLECULES

被引:244
作者
VILLAIN, J
HARTMANBOUTRON, F
SESSOLI, R
RETTORI, A
机构
[1] USMG,SPECTROMETRIE PHYS LAB,F-38042 ST MARTIN DHERES,FRANCE
[2] UNIV FIRENZE,DIPARTIMENTO CHIM,I-50144 FLORENCE,ITALY
[3] UNIV FLORENCE,DIPARTIMENTO FIS,I-50125 FLORENCE,ITALY
来源
EUROPHYSICS LETTERS | 1994年 / 27卷 / 02期
关键词
D O I
10.1209/0295-5075/27/2/014
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The relaxation time of the magnetization of a big magnetic molecule is evaluated. Isotropic exchange is assumed to be dominant, resulting in a fixed spin modulus s (equal to 20 in the case of interest). A perturbation of the form AS(z)2 results from spin-orbit coupling and produces an energy barrier As2 which separates positive and negative values of S(z). Spin-phonon interactions are treated by second-order perturbation theory. An upper limit of the pre-exponential factor in the Arrhenius law is obtained, which is consistent with the very large experimental value.
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页码:159 / 164
页数:6
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