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説明:

Suppression of 1/f noise in tunnel magnetoresistance (TMR) sensors is a central issue in the realization of magnetic field sensors with ultrafine magnetic field detectivity. Although AC modulation with an external magnetic field has been proposed as a method to shift the operating frequency of a sensor to a high frequency and substantially suppress 1/f noise, its effects on the two types of 1/f noise, that is, magnetic and electrical 1/f noise, are not well understood. In this study, we investigated the noise characteristics and signal detection performance of TMR sensors with an even-function resistance-magnetic field curve operated by the AC modulation method. For one TMR device in which the magnetic 1/f noise was dominant, AC modulation degraded the magnetic field detectivity owing to the additional noise induced by the AC modulation field. However, in another TMR device, in which the electrical 1/f noise was artificially enhanced by introducing lattice defects in the MgO tunnel barrier, AC modulation effectively suppressed the 1/f noise and improved the magnetic field detectivity by one order. This demonstrates that the AC modulation method using an external magnetic field is effective for magnetic field sensors in which electrical 1/f noise is dominant.

権利情報:

• In Copyright
  This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Tomoya Nakatani. Appl. Phys. 134, 213904 (2023) and may be found at https://doi.org/10.1063/5.0180812

キーワード: tunnel magnetoresistance, magnetic sensor, noise, 1/f noise

刊行年月日: 2023-12-07

出版者: AIP Publishing

掲載誌:

• JOURNAL OF APPLIED PHYSICS (ISSN: 00218979) vol. 134 issue. 21 p. 213904-213904

研究助成金:

• 日本学術振興会 20K04588 (科研費基盤研究(C))

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4364

公開URL: https://doi.org/10.1063/5.0180812

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更新時刻: 2024-02-16 12:27:44 +0900

MDRでの公開時刻: 2024-01-23 16:30:11 +0900