The origin of Barkhausen noise in small permalloy magnetoresistive sensors
The origin of Barkhausen noise in small permalloy magnetoresistive sensors
复制标题
小型坡莫合金磁阻传感器中巴克豪森噪声的起源
DOI：
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发表时间：
1981
期刊：
影响因子：
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通讯作者：
S. Decker
中科院分区：
文献类型：
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作者：
C. Tsang;S. Decker
坡莫合金传感器的磁阻(MR)响应越来越多地受到磁源跳跃或噪声(所谓的巴克豪森噪声)的困扰，因为它们的尺寸被减小到几十微米。这种噪音的来源目前还不清楚。在以前的工作(1)中，我们报道了通过分别测量MR响应和所涉及的域过程来研究巴克豪森噪声，但两者之间仍然缺乏详细的相关性。因此，在这项工作中，我们同时测量了通常为12μm×24μm的小MR元件的MR响应和域模式，使我们能够分析影响MR输出的域过程。我们已经确定了两类主要导致MR输出中噪声的磁化过程，即在退磁早期阶段突然的磁化壁布居减少，以及涉及N个−壁段在零场附近的成核和扩展的壁态转变。对N+→N−过渡的其他洞察是OBT...
The magnetoresistive (MR) response of permalloy sensors is increasingly plagued by jumps or noise of a magnetic origin (so‐called Barkhausen noise) as their sizes are reduced to tens of microns. The origin of this noise is not presently understood. In previous work (1) we reported a study of the Barkhausen noise by separately measuring the MR response and the domain processes involved, but detailed correlation between the two was still lacking. In this work, therefore, we performed simultaneous measurements of both the MR response and domain patterns on small MR elements of typically 12μm×24μm, enabling us to analyze the domain processes affecting the MR output. We have identified two classes of domain processes primarily responsible for noise in the MR output, namely, abrupt domain wall population reductions during early stages of demagnetization, and wall state transitions involving nucleation and expansion of N− wall segments around zero field. Additional insight into the N+→N− transitions has been obt...