Microstructures and magnetic properties of Co-Al-O granular thin films

被引：82
|
作者：
Ohnuma, M
Hono, K
Onodera, H
Ohnuma, S
Fujimori, H
Pedersen, JS
机构：
[1] Natl Res Inst Met, Tsukuba, Ibaraki 3050047, Japan
[2] Res Inst Elect & Magnet Mat, Taihaku Ku, Sendai, Miyagi 9820807, Japan
[3] Tohoku Univ, Inst Mat Res, Sendai, Miyagi 9808577, Japan
[4] Riso Natl Lab, DK-4000 Roskilde, Denmark
来源：
JOURNAL OF APPLIED PHYSICS | 2000年 / 87卷 / 02期
关键词：
D O I：
10.1063/1.371948
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
The microstructures of Co-Al-O thin films of wide varieties of compositions are studied by transmission electron microscopy and small angle x-ray scattering (SAXS). In the superparamagnetic specimens, high resolution electron microscope images reveal that isolated spherical Co particles are surrounded by an amorphous aluminum oxide matrix. However, in the soft ferromagnetic films, the shape of the Co particles is prolate ellipsoidal. SAXS intensities from the soft magnetic specimens decrease inversely with the wave vector, q, in a low wave-vector region, while an interparticle interference peak is observed for the superparamagnetic specimens. The scattering profiles of the soft magnetic films imply that the Co particles have a cylindrical shape and are randomly oriented. The correlation between the magnetic properties and the microstructures is discussed. (C) 2000 American Institute of Physics. [S0021-8979(00)00802-1].
引用
收藏
页码：817 / 823
页数：7
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