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Pt-based ferromagnetic alloy thin films are known to exhibit very large extraordinary Hall effect (EHE) with maximum Hall slope around 20μΩcm∕T at room temperature for optimum Fe–Pt alloy films. The authors report features of the EHE observed in Fe∕Pt and Co0.9Fe0.1∕Pt multilayers. For Fe∕Pt multilayers, the room temperature Hall slope is comparable with that of Fe–Pt alloy thin films over a broad sublayer thickness range. For Co0.9Fe0.1∕Pt multilayers, the Hall slope increases by tens of times, reaching 545μΩcm∕T at room temperature through choosing appropriate sublayer thickness and the number of Co0.9Fe0.1∕Pt bilayers. While keeping good linearity, the EHE sensor made of Co0.9Fe0.1∕Pt multilayers has field sensitivity of up to 1200V∕AT, appreciably higher than the sensitivity of semiconductor Hall sensors commonly used. Besides, the dynamic field range can be varied in EHE sensors with compound multilayers of Co0.9Fe0.1∕Pt and Fe∕Pt. The great enhancement in Hall slope (or sensitivity) and the adjustable operation field range are realized via manipulation of the perpendicular interface anisotropy and shape anisotropy in the multilayers.
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Zhu et al. (2007) studied this question.
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