[8a-N304-1~10] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

10:30 AM - 10:45 AM JST(1:30 AM - 1:45 AM UTC)

[8a-N304-6] Giant sensitivity of amorphous Fe-Sn films for anomalous-Nernst-type heat flux sensors

〇Kenji Tanabe¹, Kohei Fujiwara^2,3, Ko Mibu⁴, Atsushi Tsukazaki^3,5 (1.Toyota Tech. Inst., 2.Rikkyo Univ., 3.Tohoku Univ., 4.Nagoya Inst. of Tech., 5.Univ. of Tokyo)

Keywords:

Anomalous Nernst effect,amorphous,heat flux sensor

In this study, we investigated the composition and thickness dependence of anomalous Nernst effect (ANE) in amorphous Fe-Sn films to improve the sensitivity. By investigating the composition dependence of sensitivity, we found that at x=0.74, an exceptionally high sensitivity of +0.37 µm/A was achieved. This value is much larger than the reported values. This may be attributed to the low thermal conductivity of the amorphous phase and the presence of kagome-lattice fragments of Fe₃Sn, which produces a large Berry curvature. We confirmed by Mössbauer spectroscopy that about 30% of Fe in the Fe_0.74Sn_0.26 film is incorporated into kagome-lattice Fe₃Sn structure.