Title :
Novel synthetic ferrimagnet pinned Layers for metallic CPP spin valves requiring high pinning-field and output
Author :
Oshima, Hirotaka ; Nagasaka, Keiichi ; Jogo, Arata ; Ibusuki, Takahiro ; Shimizu, Yutaka ; Tanaka, Atsushi
Author_Institution :
Adv. Magnetic Recording Lab., Fujitsu Labs. Ltd., Atsugi, Japan
Abstract :
We have succeeded in enhancing the current-perpendicular-to-plane (CPP) magnetoresistance of the synthetic spin-valves by controlling the spin-dependent transport through the synthetic ferrimagnetic pinned layer using impurities. The new pinned layer overcomes the disadvantage of the synthetic pinned layer in CPP spin-valves for the magnetoresistance reduction. The experimental results are well described by our calculations based on the two-current theory. The proposed pinned layer, together with our newly developed magnetoresistive ferromagnetic materials, will be quite effective in producing CPP spin-valve sensors for ultrahigh-density data storage systems.
Keywords :
ferrimagnetic materials; magnetoresistance; spin valves; CPP spin valve; current-perpendicular-to-plane magnetoresistance; magnetoresistive ferromagnetic material; metallic CPP; pinned layer; spin-dependent transport; synthetic ferrimagnet; two-current theory; ultrahigh-density data storage system; Couplings; Laboratories; Magnetic heads; Magnetic materials; Magnetic recording; Magnetic sensors; Magnetization; Magnetoresistance; Scattering; Spin valves; Current perpendicular to plane (CPP); pinned layer; spin valve; synthetic ferrimagnet;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2005.855312