Magnetic nanostructures in a glass ceramic characterized by small angle neutron scattering

被引：9

作者：

Wiedenmannn, A

Lembke, U

Hoell, A

Müller, R

Schüppel, W

机构：

[1] Hahn Meitner Inst Kernforsch Berlin GmbH, D-14109 Berlin, Germany

[2] Univ Rostock, Fachbereich Phys, D-18051 Rostock, Germany

[3] Inst Phys Hochtechnol, D-07743 Jena, Germany

来源：

NANOSTRUCTURED MATERIALS | 1999年 / 12卷 / 5-8期

关键词：

D O I：

10.1016/S0965-9773(99)00196-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanocrystalline magnetite Fe3O4 embedded in a non-magnetic matrix was formed by heat treatment of Cn-Si-B-Fe-oxide glass. Small Angle Neutron Scattering (SANS) revealed a bimodal volume size distribution for the nanocrystalline phase with maxima centred at radii of 2.5 nm and 10 nm, respectively. The magnetic scattering behaviour is characteristic for superparamagnetism of single-domain particles following the Langevin statistics. Both fractions of nanocrystals are composed by a superparamagnetic core surrounded by a nonmagnetic surface layer. Magnetisation measurements indicate different thermal variation of the superparamagnetic moments ill both fractions of nanocrystals. (C) 1999 Acta Metallurgica Inc.

引用

页码：601 / 604

页数：4

共 6 条

[1] DETERMINATION OF PARTICLE-SIZE DISTRIBUTION-FUNCTIONS FROM SMALL-ANGLE SCATTERING DATA BY MEANS OF THE INDIRECT TRANSFORMATION METHOD [J].