Electrical and magnetic properties of nano-oxide added spin valves

Kebin Li*, Yihong Wu, Guchang Han, Jinjun Qiu, Yuankai Zheng, Zaibing Guo, Lihua An, Ping Luo

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    4 Scopus citations

    Abstract

    The nano-oxide layer (NOL) inside the spin valve can smooth the surface topography, which results in two effects: suppressing the ferromagnetic Néel magnetostatic coupling and enhancing the RKKY exchange coupling between the free layer and the pinned layer. As a consequence, MR ratio is increased in the spin valve with NOL layer inside the pinned layer or on top of the free layer. Because of the enhancement of the specular reflectivity in the NOL added spin valves, the oscillation of the interlayer coupling field with respect to the thickness of the spacer layer and even the thickness of the cap layer has been observed. In terms of the performance of both electrical and magnetic properties of the spin valves, CoFe-O turns out to be the best materials inside the pinned layer. But, as a cap layer, ZnO is the best choice because of its crystalline growth on top of the free layer CoFe, which causes the enhancement of the MR ratio. About 4.5% of MR ratio has been achieved in a NOL added spin valve in the current-perpendicular-to-plane configuration. Large MR ratio observed in the NOL added CPP sensor is due to the increment of the interface scattering and current confined path in the NOL added pinned layer.

    Original languageEnglish (US)
    Pages (from-to)22-28
    Number of pages7
    JournalThin Solid Films
    Volume505
    Issue number1-2
    DOIs
    StatePublished - May 18 2006

    Keywords

    • CIP/CPP spin valves
    • Exchange bias
    • Giantmagnetoresistance
    • Interlayer coupling
    • Nano-oxide layer

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Surfaces and Interfaces
    • Surfaces, Coatings and Films
    • Metals and Alloys
    • Materials Chemistry

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