Tuning giant anomalous Hall resistance ratio in perpendicular Hall balance

Anomalous Hall effect at room temperature in perpendicular Hall balance with a core structure of [Pt/Co](4)/NiO/[Co/Pt](4) has been tuned by functional CoO layers, where [Pt/Co](4) multilayers exhibit perpendicular magnetic anisotropy. A giant Hall resistance ratio up to 69 900% and saturation Hall resistance (R-S(P)) up to 2590 m Omega were obtained in CoO/[Pt/Co](4)/NiO/[Co/Pt](4)/CoO system, which is 302% and 146% larger than that in the structure without CoO layers, respectively. Transmission electron microscopy shows highly textured [Co/Pt](4) multilayers and oxide layers with local epitaxial relations, indicating that the crystallographic structure has significant influence on spin dependent transport properties. (c) 2015 AIP Publishing LLC.