Dipolar interaction and incoherent quantum tunneling: a Monte Carlo study of magnetic relaxation

被引：43

作者：

Cuccoli, A

Fort, A

Rettori, A

Adam, E

Villain, J

机构：

[1] Univ Florence, Dipartimento Fis, I-50125 Florence, Italy

[2] Ist Nazl Fis Mat, I-50125 Florence, Italy

[3] CNR, Ist Elettron Quantist, I-50127 Florence, Italy

[4] CEA Grenoble, Dept Rech Fondamentale Mat Condensee, F-38054 Grenoble 9, France

[5] CNRS, Ctr Rech Tres Basses Temp, F-38042 Grenoble 9, France

来源：

EUROPEAN PHYSICAL JOURNAL B | 1999年 / 12卷 / 01期

关键词：

61.46; +w Clusters; nanoparticles; and nanocrystalline materials; 75.40.Mg Numerical simulation studies; 75.45.+j Macroscopic quantum phenomena in magnetic systems; 75.50.Xx Molecular magnets;

D O I：

10.1007/s100510050974

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We study the magnetic relaxation of a system of localized spins interacting through weak dipole interactions, at a temperature large with respect to the ordering temperature but low with respect to the crystal field level splitting. The relaxation results from quantum spin tunneling but is only allowed on sites where the dipole field is very small. At low times, the magnetization decrease is proportional to root t as predicted by Prokofiev and Stamp, and at long times the relaxation can be described as an extension of a relaxed zone. The results can be directly compared with very recent experimental data on Fee molecular clusters.

引用

页码：39 / 46

页数：8

共 9 条

[1] Class of Monte Carlo algorithms for dynamic problems leads to an adaptive method [J].