Magnetic and Magnetotransport properties of pulsed laser deposited Fe₉₀Ta₁₀ thin films

3d/4d structures involving heavy transition elements have long been known to possess good permanent magnetic properties because of their ability to induce large anisotropy in structures such as L1₀ magnets. Reports suggest that low content of Tantalum (W) has the potential to induce large magneto crystalline anisotropy and increase magnetization in iron as a result of large spin-orbit coupling of 4d elements which can lead to strong 3d/4d hybridization. Fe₉₀Ta₁₀ thin films exhibited enhanced coercivities (259.76 Oe) and saturation magnetization (425 emu/cm³). The results have shown that the easy magnetization direction was in-plane which was structurally determined by xrd to be (111).The anisotropy energy was calculated, which is larger than many known ferromagnetic materials. We have also observed Extra-ordinary Hall Effect in Fe-Ta films which establishes the scaling behavior of the extraordinary Hall constant, R_s. An involved analysis of high-resolution Hall (B, T) data recorded at temperature from 5 to 300 K shows that the scaling exponent, n in R_s ~ ρⁿ, where ρ is the Ohmic resistivity, is ~ 1.1 ± 0.1. Theoretically, for homogeneous ferromagnets, n = 1 corresponds to Smit classical asymmetric scattering while n = 2 is attributed to the quantum mechanical side-jump scattering