Composition‐Tuned Enhancement of the Anomalous Nernst Effect in FeCo–Pt Thin Films on Rigid and Flexible Substrates

In this study, we systematically investigated the anomalous Nernst effect (ANE) in (Fe 50 Co 50 ) 1‐ x Pt x thin films deposited on rigid quartz and flexible polycarbonate substrates, highlighting significant quantitative improvements compared to conventional ferromagnetic alloys. By carefully tuning the Pt composition, we achieved notable ratios in the anomalous Nernst coefficient ( S ANE ) and transverse thermoelectric constant ( α xy ), yielding a | α xy |/| σ xy | ratio close to the well‐known k B /2e benchmark observed in topological magnets. The S ANE magnitude exhibited a significant fourfold enhancement, increasing from 0.57 µV/K for the Pt‐free sample to around 2.4 µV/K at x = 22.5%. Furthermore, we illustrated how our films achieve ANE sensitivities around 0.19 μm·A −1 , comparable to leading materials. Our results underscore a promising new avenue by demonstrating that even structurally disordered or weakly ordered systems can exhibit significant Berry curvature‐related transport effects traditionally associated with crystalline lattices. This not only highlights the quantitative strength of our approach but also its practical versatility, as these films can be deposited on flexible substrates at room temperature. Our work presents a novel contribution to the field of spin caloritronics, exploring underinvestigated territory in structurally disordered magnetic materials, and paving the way for future flexible ANE devices.