Synthesis and magnetic properties of CoPt3 nanoparticle assemblies containing copper

被引：7

作者：

Frommen, C ^{[1
]}

Malik, S ^{[1
]}

Würfel, JU ^{[1
]}

Rösner, H ^{[1
]}

Didschies, C ^{[1
]}

机构：

[1] Forschungszentrum Karlsruhe, Helmholtz Gemeinschaft, Inst Nanotechnol, D-76021 Karlsruhe, Germany

来源：

MATERIALS LETTERS | 2004年 / 58卷 / 06期

关键词：

synthesis; nanoparticles; annealing; magnetic recording; electron microscopy;

D O I：

10.1016/j.matlet.2003.07.033

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Nanoparticles Of CoPt3-Cu with an average atomic composition Of Co20Cu20Pt60 (similar to3 nm) were prepared by a polyol process and deposited onto silicon wafers for magnetic studies. A post-heat treatment of the resulting nanoparticle assemblies at temperatures up to 600 degreesC led to coercive fields of H-c=0.35 T at 5 K and H-c=0.06 T at 300 K with particle sizes ranging from 10 to 30 nm after annealing. The onset of chemical long-range order for samples annealed at 500 degreesC was observed by X-ray powder diffraction. The addition of copper reduced the fcc-disordered to fcc-ordered phase transition temperature by 250 degreesC compared with pure CoPt3 nanoparticles. (C) 2003 Elsevier B.V. All rights reserved.

引用

页码：953 / 958

页数：6

共 29 条

[1] Size dependence of the properties of hematite nanoparticles [J].