Ultrahigh sensitivity Hall effect in magnetic multilayers
Ultrahigh sensitivity Hall effect in magnetic multilayers
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DOI：
10.1063/1.2426896
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发表时间：
2007-01
影响因子：
4
通讯作者：
Yun Zhu;J. Cai
中科院分区：
文献类型：
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作者：
Yun Zhu;J. Cai
铂基铁磁合金薄膜具有很大的异常霍尔效应，室温下最大霍尔斜率约为20μΩcm/T，是制备最佳Fe-铂合金薄膜的最佳材料。本文报道了在Fe/Pt和Co0.9Fe0.1/Pt多层膜中观察到的EHE特征。对于Fe/铂多层膜，在较宽的亚层厚度范围内，其室温霍尔斜率与Fe-铂合金薄膜的霍尔斜率相当。对于Co0.9Fe0.1/Pt多层膜，通过选择合适的子层厚度和Co0.9Fe0.1/Pt双层膜的数目，霍尔斜率增加了几十倍，室温下达到545μΩcm/T。由Co0.9Fe0.1/Pt多层膜制成的EHE传感器在保持良好线性度的同时，场灵敏度高达1200V/AT，略高于常用的半导体霍尔传感器的灵敏度。此外，Co0.9Fe0.1/Pt型和Fe/Pt型复合多层膜的EHE传感器的动态电场范围可以改变。霍尔斜率(或灵敏度)和调节器的极大增强。
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 adjustab...