Title :
Magnetism of Co1-xFex-NOL in specular spin-valves
Author :
Doi, Masaaki ; Izumi, Masato ; Fuke, Hiromi Niu ; Iwasaki, Hitoshi ; Sahashi, Masashi
Author_Institution :
Dept. of Electron. Eng., Tohoku Univ., Sendai, Japan
fDate :
7/1/2004 12:00:00 AM
Abstract :
We investigated the magnetic properties of the Co1-xFex-natural oxidized nano-oxide layer (NOL) in the specular spin-valve system by precise measurement of magnetization at 77 K and M-T curves after field cooling at ±5 kOe. The result suggests the antiferromagnetic component behavior of the NOL and its Ne´el temperature (TN) shifts to the higher temperature with increasing Fe composition. Below the TN, the antiparallel spin configuration at the pinned layers is stabilized by the exchange bias field induced from antiferromagnetic component of NOL by the field cooling in negative field direction.
Keywords :
amorphous magnetic materials; antiferromagnetic materials; cobalt alloys; exchange interactions (electron); giant magnetoresistance; magnetisation; nanostructured materials; spin valves; 77 K; CoFe; M-T curves; Neel temperature; antiferromagnetic component behavior; antiparallel spin configuration; exchange bias field; exchange coupling; field cooling; giant magnetoresistance; magnetic properties; magnetization measurement; nano-oxide layer; negative field direction; pinned layers; precise measurement; specular reflection; specular spin-valves; Antiferromagnetic materials; Chromium; Couplings; Giant magnetoresistance; Iron; Magnetic multilayers; Magnetic properties; Magnetization; Oxidation; Temperature; Exchange coupling; NOL; giant magnetoresistance; nano-oxide layer; specular reflection; spin-valves;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2004.830407
