Structural and magnetic properties of Co₂FeAl _0.5Si_0.5 full-heusler alloy thin films on gaas substrates

We investigated the structural and magnetic properties of Co ₂FeAl₀₅Si₀₅ (CFAS) thin films on GaAs substrates. The CFAS thin films grew epitaxially on GaAs with CFAS (100)[100] || GaAs (100)[100] relation and formed an ordered L2₁structure with substrate heating deposition at T_SUB = 300^°C, 400 ^°C and post annealed at T_PA = 400^°C Moreover, we confirmed the no reaction between CFAS and GaAs. The CFAS thin films on GaAs showed strong uniaxial magnetic anisotropy with an easy axis of [1 10]_CFAS ([110]_GaAs) direction and the magnetic anisotropy generally increased by decreasing the thickness of CFAS. The magnetic moment of the CFAS film deposited with substrate heating at 300 °C was approximately 4.8μ_B/f.u. at room temperature.