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arXiv · 2406.18811

1/f noise of a tiny tunnel magnetoresistance sensor originated from a wide distribution of bath correlation time

Hiroshi Imamura·Hiroko Arai·Rie Matsumoto·Toshiki Yamaji
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Abstract

Tunnel magnetoresistance (TMR) sensor is a highly sensitive magnetic field sensor and is expected to be applied in various fields, such as magnetic recording, industrial sensing, and bio-medical sensing. To improve the detection capability of TMR sensors in low frequency regime it is necessary to suppress the 1/f noise. We theoretically study 1/f noise of a tiny TMR sensor using the macrospin model. Starting from the generalized Langevin equation, 1/f noise power spectrum and the Hooge parameter are derived. The calculated Hooge parameter of a tiny TMR sensor is much smaller than that of a conventional TMR sensor with large junction area. The results provide a new perspective on magnetic 1/f noise and will be useful for improvement of TMR sensors.

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Hiroshi Imamura, Hiroko Arai, Rie Matsumoto, Toshiki Yamaji. 2024-06-27. 1/f noise of a tiny tunnel magnetoresistance sensor originated from a wide distribution of bath correlation time. https://doi.org/10.1103/physrevapplied.22.014032

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