Fe-Sn nanocrystalline films for flexible magnetic sensors with high thermal stability

Y. Satake, K. Fujiwara, J. Shiogai, T. Seki, A. Tsukazaki

研究成果: Article査読

20 被引用数 (Scopus)


The interplay of magnetism and spin-orbit coupling on an Fe kagome lattice in Fe 3 Sn 2 crystal produces a unique band structure leading to an order of magnitude larger anomalous Hall effect than in conventional ferromagnetic metals. In this work, we demonstrate that Fe-Sn nanocrystalline films also exhibit a large anomalous Hall effect, being applicable to magnetic sensors that satisfy both high sensitivity and thermal stability. In the films prepared by a co-sputtering technique at room temperature, the partial development of crystalline lattice order appears as nanocrystals of the Fe-Sn kagome layer. The tangent of Hall angle, the ratio of Hall resistivity to longitudinal resistivity, is maximized in the optimal alloy composition of close to Fe 3 Sn 2 , implying the possible contribution of the kagome origin even though the films are composed of nanocrystal and amorphous-like domains. These ferromagnetic Fe-Sn films possess great advantages as a Hall sensor over semiconductors in thermal stability owing to the weak temperature dependence of the anomalous Hall responses. Moreover, the room-temperature fabrication enables us to develop a mechanically flexible Hall sensor on an organic substrate. These demonstrations manifest the potential of ferromagnetic kagome metals as untapped reservoir for designing new functional devices.

ジャーナルScientific reports
出版ステータスPublished - 2019 12月 1

ASJC Scopus subject areas

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