Quantum tunneling of the magnetization in an iron cluster nanomagnet

被引：666

作者：

Sangregorio, C ^{[1
]}

Ohm, T ^{[1
]}

Paulsen, C ^{[1
]}

Sessoli, R ^{[1
]}

Gatteschi, D ^{[1
]}

机构：

[1] UNIV FLORENCE,DEPT CHEM,I-50144 FLORENCE,ITALY

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 24期

关键词：

D O I：

10.1103/PhysRevLett.78.4645

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We have investigated the;magnetic relaxation of clusters of eight iron ions characterized by a spin ground state of ten- and an Ising anisotropy. Below 400 mK the relaxation rate is temperature independent suggesting that tunneling of the magnetic moment across its anisotropy energy barrier occurs. Using the anisotropy constants derived from EPR data, we can calculate-both the-crossover: temperature T-c and the expected tunneling frequency 1/tau. The field dependence of the relaxation shows evidence of resonant tunneling.

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页码：4645 / 4648

页数：4

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