MACROSCOPIC QUANTUM TUNNELING EFFECTS OF BLOCH WALLS IN SMALL FERROMAGNETIC PARTICLES

被引：32

作者：

PAULSEN, C

SAMPAIO, LC

BARBARA, B

TUCOULOUTACHOUERES, R

FRUCHART, 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,SAKURA,IBARAKI 305,JAPAN

来源：

EUROPHYSICS LETTERS | 1992年 / 19卷 / 07期

关键词：

FINE-PARTICLE SYSTEMS; MAGNETIC AFTEREFFECTS; OTHER TOPICS IN MAGNETIC PROPERTIES AND MATERIALS;

D O I：

10.1209/0295-5075/19/7/013

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

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 temperature (down to 50 mK) and with a field up to 8 Tesla. A change between thermally activated and temperature-independent relaxation has been observed near T(c) = 0.6 Y, All the results obtained at low temperature are consistent with theoretical predictions of Macroscopic Quantum Tunnelling with weak dissipation in a ferromagnetic system.

引用

页码：643 / 648

页数：6

共 25 条

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