Soft Magnetic Properties of [Fe80Ni20-O/NiZn-Ferrite]n Multilayer Thin Films for High Frequency Application

In this research, a series of [Fe₈₀Ni₂₀-O/NiZn-ferrit_n multilayer thin films with different insulation layer thickness were prepared by magnetron sputtering at room temperature. The high frequency soft magnetic properties of [Fe₈₀Ni₂₀-O/NiZn-ferrit_n multilayer thin films were investigated. It was found that the in-plane magnetic anisotropy field (H_k) and saturation magnetizations (4πM_s) can be adjusted by changing the insulation layer thickness, and the optimal H_k and 4πM_s can be obtained as the insulation layer thickness of 2.5 nm. The adjustment of insulation layer thickness is essential to obtain low coercivity (H_c) and high permeability (μ) of the multilayer thin films. The measured resistivity (ρ) of [Fe₈₀Ni₂₀-O/NiZn-ferrit_n multilayer thin films was increased from 211 to 448 μΩcm with increasing the insulation layer thickness.