GMR and TMR Films Using GdFe Alloy with Perpendicular Magnetization

Abstract

We observed hysteresis loops of resistance in GMR and TMR films using GdFe alloy with perpendicular. The MR ratio of GMR film was approximately 0.036% when the thickness of Cu film was 4 nm. Al₅₀Cu₅₀ film with a surface roughness of approximately 0.2 nm was used for the under electrode of TMR film. The Al₂O₃ film was prepared by direct deposition on an Al₂O₃ target, and atomic ratio O/Al of the Al₂O₃ film was 1.52 according to an RBS analysis. The MR ratio of TMR film was approximately 0.95% when the thickness of Al₂O₃ film was 2.2 nm.