Structure, magnetic and electrical transport properties of cosputtered Fe 0.5Ge 0.5 nanocomposite films

Abstract

Fe 0.5Ge 0.5 nanocomposite films with different film thicknesses were fabricated using cosputtering. The films are composed of Ge, Fe and Fe 3Ge 2, and are ferromagnetic at room temperature. The saturation magnetization and magnetic interaction including dipolar interaction and exchange coupling increase with the increasing film thickness. The electrical conductance mechanism turns from metallic to semiconducting and the saturation Hall resistivity ρ xys increases with the decreasing film thickness. At 28 nm, ρ xys is ∼137 μΩ cm at 2 K, about 150 times larger than that of pure Fe film (0.9 μΩ cm) and four orders larger than that of bulk Fe. The ρ xy – H curves of all the films show the same linearity character in low-field range even though the temperature-independent slope is different at different film thicknesses. At high temperatures, the skew scattering mechanism is dominant. At low temperatures, side-jump effect should be dominant at large resistivity ρ xx regime for the thin films, and the skew scattering is dominant at small ρ xx regime for the thick films.