アモルファスFeB薄膜の磁気および磁歪特性に対する希土類元素添加効果

概要

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Improvements in the magnetic and magnetostrictive properties of amorphous FeB sputtered films were achieved by doping them with rare earth elements (RE=Pr and Tb) were examined in detail for the composition system Fe_<100-χ-yB_χRE_y(χ=15-40 at%, y=0-3.5at%). It was found that magnetic softening is promoted by adding a small amount of RE(y=1 at%for Pr, y=1.5 at%for Tb), while ensuring that film maintains a relatively high magnetostriction constant. These properties remain almost completely insensitive to thermal annealing at temperatures up to 350℃, suggesting that RE elements with large ion radii act as impurity elements, causally stabilization of the amorphous structure and an increase in the electrical resistivily. The linear change of λ us. H without any hysteresis loop and the high magnetostrictive sensitivity dλ/dH are very favorable for sensor and/or actuator applications.
社団法人日本磁気学会の論文
1998-04-15