MESOSCOPIC QUANTUM TUNNELING IN SMALL FERROMAGNETIC PARTICLES

被引：5

作者：

PAULSEN, C

SAMPAIO, LC

TACHOUERES, RT

BARBARA, B

FRUCHART, D

MARCHAND, A

THOLENCE, JL

UEHARA, M

机构：

[1] CNRS,LAB MAGNETISME LOUIS NEEL,166X,F-38042 GRENOBLE,FRANCE

[2] CNRS,RECH TRES BASSES TEMP LAB,F-38042 GRENOBLE,FRANCE

[3] NATL RES INST MET,IBARAKI 305,JAPAN

[4] CNRS,CRISTALLOG LAB,F-38042 GRENOBLE,FRANCE

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 116卷 / 1-2期

关键词：

D O I：

10.1016/0304-8853(92)90140-J

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic relaxation of a set of small ferromagnetic particles of Tb0.5Ce0.5Fe2 of mean diameter 150 angstrom has been measured at low temperatures (down to 50 mK) and with a field up to 6 kOe. A crossover temperature has been observed at T(c) = 1.2 K between thermal activation and quantum tunneling regimes. The field dependence of the crossover temperature has been determined, T(c)alpha square-root H. This is the first example of quantum tunneling of domain walls on a mesoscopic scale detected in small ferromagnetic particles in agreement with the theory.

引用

页码：67 / 69

页数：3

共 13 条

[1] OBSERVATION OF MACROSCOPIC SPIN PHENOMENA IN NANOMETER-SCALE MAGNETS [J].