발간논문

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Vol.28, No.3, 252 ~ 260, 1990
Title
The Effects of Aging and Protective coatings on the Magnetic Properties of Co - evaporated Gd - Fe and Tb - Fe Alloy Films
서창규Chang Kyu Suh, 이성래Seong Rae Lee
Abstract
The magnetic properties and their degradation kinetics of thermally coevaporated Gd-Fe and Tb-Fe amorphous alloy films during aging under atmospheric pressure and vacuum were studied using the torque magnetometry and polar Kerr rotation hysteresisgraphy. The perpendicular magnetic anisotropy existed in the range of 20-30 at%Gd and 15-35 at%Tb. The degradation of Ku during aging was increased with RE content and this was largely due to the rate and amount of the structureal relaxation and the oxidation with RE content. The activation energies for degradation was in the range of 0.61-1 eV and 0.47-0.91 eV for Gd-Fe and Tb-Fe respectively and the n values were increased and the activation energy were decreased with RE content. Al coated films have lower n values and higher activation energy than those of SiO coated films. Al was found to be more effective for protective coating than SiO at high temperature. Thickness of more than 500Å for SiO and 200Å for Al was found to be needed to protect the RE-TM alloy films from the oxidation.
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