FINITE-SIZE EFFECTS IN THE MAGNETIC-PROPERTIES OF FERROMAGNETIC CLUSTERS

被引：70

作者：

HENDRIKSEN, PV ^{[1
]}

LINDEROTH, S ^{[1
]}

LINDGARD, PA ^{[1
]}

机构：

[1] RISO NATL LAB,DEPT PHYS,DK-4800 ROSKILDE,DENMARK

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 1992年 / 104卷

关键词：

D O I：

10.1016/0304-8853(92)91461-2

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Model calculations of the spontaneous magnetization of ferromagnetic clusters of various structures and sizes have been performed. The exchange interaction is modelled with the Heisenberg model, and a self-consistent spin-wave-spectrum is found by direct diagonalization of the equation of motion of S+. Mean-field calculations are performed for comparison and in order to infer high-temperature behaviour. The finite size is found to cause large deviation from the normal Bloch T3/2-law for the spontaneous magnetization at low temperatures and to lower the Curie temperature.

引用

页码：1577 / 1579

页数：3