Enhancement of magnetoresistance by ultra-thin Zn wüstite layer

We have investigated a hybrid magnetic material composed of ultra-thin oxide spin-filtering layer/ferromagnetic layer (FML) for magnetoresistance (MR) enhancement. Using Zn-Fe oxide/Fe 50 Co 50 as a free layer in current-perpendicular-to-plane giant magnetoresistive films, the MR ratio and Δ RA (the...

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Bibliographic Details
Published in:Applied physics letters 2011-09, Vol.99 (13), p.132103-132103-3
Main Authors: Fuji, Yoshihiko, Hara, Michiko, Yuasa, Hiromi, Murakami, Shuichi, Fukuzawa, Hideaki
Format: Article
Language:English
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Summary:We have investigated a hybrid magnetic material composed of ultra-thin oxide spin-filtering layer/ferromagnetic layer (FML) for magnetoresistance (MR) enhancement. Using Zn-Fe oxide/Fe 50 Co 50 as a free layer in current-perpendicular-to-plane giant magnetoresistive films, the MR ratio and Δ RA (the change of resistance area product) were enhanced to 26.0% and 52mΩ μ m 2 at a small RA (resistance area product) of about 0.2 Ω μ m 2 , respectively. Structural analysis revealed that the Zn wüstite structure is responsible for the enhancement of the MR ratio, and spin-polarization of wüstite/FML is higher than that of spinel ferrite/FML.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3644470