MESOSCOPIC QUANTUM TUNNELING IN SMALL FERROMAGNETIC PARTICLES

被引：42

作者：

PAULSEN, C

SAMPAIO, LC

BARBARA, B

FRUCHARD, D

MARCHAND, A

THOLENCE, JL

UEHARA, M

机构：

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

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

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

来源：

PHYSICS LETTERS A | 1991年 / 161卷 / 03期

关键词：

D O I：

10.1016/0375-9601(91)90024-3

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The magnetic relaxation of a set of ferromagnetic small 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) is-proportional-to square-root H. The behavior is in accordance with the theory of single Bloch wall tunneling in the grains, involving almost-equal-to 10(5) magnetic moments.

引用

页码：319 / 322

页数：4

共 20 条

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