TY - JOUR
T1 - Fe-Sn nanocrystalline films for flexible magnetic sensors with high thermal stability
AU - Satake, Y.
AU - Fujiwara, K.
AU - Shiogai, J.
AU - Seki, T.
AU - Tsukazaki, A.
N1 - Funding Information:
The authors thank K. Nakahara, M. Kawasaki, H. Kato, N. Shibata, and H. Nishikawa for their helpful advice and K. Takanashi, S. Ito and F. Sakamoto for their assistance with experiments. This work was partly supported by JSPS KAKENHI (Grant Nos. 25000003 and JP15H05853) from the Japan Society for the Promotion of Science and Kumagai Foundation for Science and Technology.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85062278796&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85062278796&partnerID=8YFLogxK
U2 - 10.1038/s41598-019-39817-8
DO - 10.1038/s41598-019-39817-8
M3 - Article
C2 - 30824854
AN - SCOPUS:85062278796
SN - 2045-2322
VL - 9
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 3282
ER -