Anisotropic Nd–Fe–B thin‐film magnets for milli‐size motor
作者:
S. Yamashita,
J. Yamasaki,
M. Ikeda,
N. Iwabuchi,
期刊:
Journal of Applied Physics
(AIP Available online 1991)
卷期:
Volume 70,
issue 10
页码: 6627-6629
ISSN:0021-8979
年代: 1991
DOI:10.1063/1.349879
出版商: AIP
数据来源: AIP
摘要:
Efforts were made to obtain anisotropic thin‐film magnets at low substrate temperature. This is an important criterion for practical applications such as to build motors. The influence of substrate materials as well as film thickness on thec‐axis orientation were studied. It has been shown that thin‐film magnets with the easy axis of magnetization normal to the film plane could be deposited at a substrate temperature of around 450 °C by choosing the composition near the line from Nd13Fe76B11to Nd13Fe70B17in the ternary phase diagram. It was found that the anisotropic film magnets could be also deposited on the metallic substrate. Thec‐axis orientation tended to be isotropic with an increase in film thickness. The obtained results were used to fabricate a milli‐size motor by depositing 20‐&mgr;m‐thick Nd–Fe–B films on a silicon steel disk substrate of 5‐mm diam. The milli‐size motor exhibited a torque of 0.8 g mm at a rotational speed of 3000 rpm.
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