Magnetotransport properties of Co-Fe/Al-N/Co-Fe tunnel junctions with large tunnel magnetoresistance ratio

The investigation of the magnetotransport properties of tunnel junction with the structure of Ta 5 nm/Cu 20 nm/Ta 5 nm/Ni₇₆Fe₂₄2 nm/Cu 5 nm/Mn₇₅Ir₂₅ 10 nm/Co₇₁Fe₂₉ 4 nm/Al-N/Co₇₁Fe₂₉ 4 nm/Ni₇₆Fe₂₄ 20 nm/Ta 5 nm was discussed. The local transport properties were studied using conducting atomic force microscope for Ta 5 nm/Cu 20 nm/Ta 5 nm/Ni ₇₆Fe₂₄ 2 nm/Cu 5 nm/Mn₇₅Ir₂₅ inorder to clarify the annealing temperature dependence of TMR ratio. The leakage current was observed and the TMR ratio decreased, after annealing at 340°C. Tunnel magnetoresistance ratio (TMR) at 300°C was elucidated.