Improvement of the detectivity in an Fe-Sn magnetic-field sensor with a large current injection

Junichi Shiogai, Zhenhu Jin, Yosuke Satake, Kohei Fujiwara, Atsushi Tsukazaki

研究成果: ジャーナルへの寄稿学術論文査読

1 被引用数 (Scopus)


A ferromagnetic nanocrystalline Fe-Sn is an excellent platform for magnetic-field sensor based on anomalous Hall effect (AHE) owing to simple fabrication and superior thermal stability. For improvement of the magnetic-field sensitivity, doping impurity and increasing injection current are effective approaches. However, in the light of magnetic-field detectivity, the large current may increase the voltage noise. In this study, a maximum allowable current was improved by employing the overlayer electrode configuration on a Ta-doped Fe-Sn AHE sensor. In noise measurements, the 1/f noise becomes significant with increasing the current at low frequency, resulting in saturation of the detectivity to 240 nTHz-1/2 at 120 Hz. At high frequency, the detectivity reaches 48 nTHz-1/2 at 3.1 mA showing ten times improvement of the detectivity compared with the non-doped Fe-Sn AHE sensor. Material design and device structure optimization will accelerate further improvement of the sensing properties of the Fe-Sn-based AHE sensor.

ジャーナルJapanese Journal of Applied Physics
出版ステータス出版済み - 2022 5月


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