Title :
Spin-valve-like properties and annealing effect in ferromagnetic tunnel junctions
Author :
Sato, Masashige ; Kobayashi, Kazuo
Author_Institution :
Fujitsu Labs. Ltd., Atsugi, Japan
fDate :
9/1/1997 12:00:00 AM
Abstract :
We fabricated ferromagnetic tunnel junctions with naturally oxidized Al barriers, and investigated the effects of Al oxidization time, Al thickness and annealing temperature on the tunnel properties. Changes of between 10 and 15% have been observed in the resistance, and in some junctions, the MR ratios increase by annealing at 250 to 300°C. The Ni-Fe/Co/Al-AlOx/Co/Ni-Fe/Fe-Mn/NiFe junction showed a 24% spin-valve-like MR change after annealing at 300°C for one hour
Keywords :
aluminium; aluminium alloys; aluminium compounds; annealing; cobalt; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic annealing; magnetic heads; magnetic multilayers; manganese alloys; nickel alloys; oxidation; 1 h; 250 to 300 C; Al oxidization time; Al thickness; Ni-Fe/Co/Al-AlOx/Co/Ni-Fe/Fe-Mn/NiFe junction; NiFe-Co-Al-AlO-FeMn; annealing effect; annealing temperature; ferromagnetic tunnel junctions; spin-valve-like properties; Annealing; Conductivity; Insulation; Laboratories; Magnetic field measurement; Magnetic heads; Magnetic separation; Magnetization; Spin valves; Temperature;
Journal_Title :
Magnetics, IEEE Transactions on
