Effect of Low Substrate Temperature on the Magnetic Properties and Domain Structure of Fe₇₀Ga₃₀ Thin Films

摘要

We report on the effect of low substrate temperature on the correlation between structure, magnetic properties, and micromagnetic behavior of Fe₇₀Ga₃₀ thin films. The enhanced grain size and the decrease in the number of pinning centers are in correlation with the enhanced saturation magnetization and domain size (~0.2– $0.5~mu ext{m}$ ), respectively. Estimated effective magnetic anisotropy energy ( $K_{mathrm {eff}}$ ) is found to increase with substrate temperature from $7.5 imes 10^{5}$ J/m^{3 (room temperature) to $13.6 imes 10^{5}$ J/m3 (350 °C). The coercivity variation from the object-oriented micromagnetic framework (OOMMF) simulation is in line with respect to experimental values. Spin structure from simulation also indicates multiple-domain configuration when there is a magnetization reversal.}