Microstructure and magnetic property of Fe-Al2O3 granular films

被引：5

作者：

Bian, B

Hirotsu, Y

Makino, A

机构：

[1] Osaka Univ, Inst Sci & Ind Res, Osaka 567, Japan

[2] Alps Elect Co Ltd, Cent Res Lab, Nagaoka, Niigata 940, Japan

来源：

NANOSTRUCTURED MATERIALS | 1997年 / 8卷 / 08期

关键词：

D O I：

10.1016/S0965-9773(98)00040-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Granular magnetic films composed of randomly or highly oriented Fe nanoparticles covered with amorphous Al2O3 have been synthesized by electron beam deposition. The highly oriented Fe nanocrystals are prepared by taking advantage of the epitaxial growth of alpha-Fe on <100> oriented Au "seed" nanoparticles, which are epitaxially grown on a (100) NaCl substrate. The magnetic coercivity of the granular films with randomly oriented Fe nanocrystals is inversely proportional to the intergranular distance. For the film with an average Fe thickness of about 3 nm, the coercivity and the electrical resistivity are 944 Aim and 154000 mu Omega cm, respectively. Coercivity of highly oriented granular films with similar average Fe thickness is generally one order higher than that of granular films with randomly oriented Fe particles. It is shown that the size, intergranular distance and crystalline orientation can be controlled by epitaxial growth on "seed" particles. (C) 1998 Acta Metallurgica Inc.

引用

页码：1057 / 1066

页数：10

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