CoPd合金中氢的异常霍尔效应检测
Detection of hydrogen by the extraordinary Hall effect in CoPd alloys
摘要：
研究了氢吸附对CoPd铁磁薄膜中异常霍尔现象（EHE）的影响。氢的吸附在非常霍尔效应系数中增加了一个正项，并通过磁滞回线的矫顽力和剩磁的相应变化来修改垂直磁各向异性。氢敏组分在Co浓度为20% < x < 50%的范围内响应最强，在EHE极性反转点x_0 ~ 38%附近响应最强。根据薄膜成分和操作领域，CoPd对低浓度氢的EHE响应可以达到数百%，这使得该方法和材料对于氢传感具有吸引力。
英文摘要：
Effect of hydrogen adsorption on the extraordinary Hall phenomenon (EHE) in ferromagnetic CoPd films is studied as a function of composition, thickness, substrate and hydrogen concentration in atmosphere. Adsorption of hydrogen adds a positive term in the extraordinary Hall effect coefficient and modifies the perpendicular magnetic anisotropy with the respective changes in coercivity and remanence of hysteresis loops. Hydrogen sensitive compositions are within the Co concentration range 20% < x < 50% with the strongest response near the EHE polarity reversal point x_0 ~ 38%. Depending on the film composition and field of operation the EHE response of CoPd to low concentration hydrogen can reach hundreds percent, which makes the method and the material attractive for hydrogen sensing.
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