[11p-E214-1~13] 10.1 Emerging materials in spintronics and magnetics (including fabrication and characterization methodologies)

4:00 PM - 4:15 PM JST(7:00 AM - 7:15 AM UTC)English Presentation

[11p-E214-10] Composition dependence of crystal structure transition and anomalous Hall and Nernst effects in Fe₅₀Pt_50-xAl_x alloy thin films

〇Hiroto Imaeda¹, Nanhe Kumar Gupta³, Benugopal Bairagya^2,3, Kenji Tanabe¹, Yuya Sakuraba^2,3 (1.Toyota Tech Inst., 2.Univ. of Tsukuba, 3.NIMS)

Keywords:

spintronics,Heusler alloy,anomalous Nernst effect

Motivated by predictions of a large anomalous Nernst effect (ANE) in tetragonally distorted Fe₂PtAl, we investigated structural transitions and transport properties in epitaxial Fe₅₀Pt_50-xAl_x (x = 0 - 25) thin films. XRD revealed a sharp transition from a cubic B2 phase (x = 25, 20) to a distorted tetragonal phase at x = 15 (c/a = 0.88). The x = 25 film exhibited a Nernst coefficient of 0.62 µV/K. These results establish a critical boundary for engineering tetragonal Heusler phases for thermoelectric applications.