1/f noise in anisotropic and giant magnetoresistive elements

Abstract

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An integrated and sensitive detection platform for magneto-resistive biosensors

“…Thermally excited changes in the magnetization directions of such magnetic domains result in magnetic fluctuations with a magnitude ensemble average that translates to an inverse dependency on frequency. The magnetic fluctuations are translated into resistance fluctuations via the dependence of the resistance on the angle of the magnetization (van de Veerdonk et al, 1997). Note that the magnetization 1/f noise is superimposed on the sensor resistance, whereas the other noise sources contribute directly to the sensor voltage.…”

Effects of spacer layer on growth, stress and magnetic properties of sputtered permalloy film

“…Unfortunately, magnetoresistance sensors exhibit a considerable amount of 1/f noise [6], which is associated with domain wall motion. This is a problem for military applications since the targets move slowly.…”

Low-frequency magnetic noise in magnetic tunnel junctions

“…Such fluctuations determine a fundamental noise limit for MR-based devices. 8,9 However, Reed et al measured 1/f noise in MTJ sensors and observed that low-frequency sensor noise is dominated by resistance fluctuations in the tunnel barrier, and that these resistance fluctuations are due to charge trapping in the barrier. 10 In order to clarify the physical origin and evaluate the noise level of 1/f noise in MTJ's, we conducted a systematic study of low-frequency noise in high-quality MTJ sensors under different magnetic environment, i.e., with and without a hard-axis bias field perpendicular to the magnetic easy axis of the sample.…”