Good High-Frequency and Soft Magnetic Properties of (Ni75Fe25)x(ZnO)1−x Nano-Granular Films with Wide Metal Volume Fraction (x) Range

Excellent soft magnetic properties in a wide x range with coercivity not exceeding 5.0 Oe were obtained successfully in the (Ni 75 Fe 25 ) x (ZnO) 1− x granular films which were fabricated by the magnetic alloy Ni 75 Fe 25 and semiconductor ZnO. For the typical sample with x = 0.74, coercivities in hard and easy axes are 1.1 and 1.7 Oe, respectively, and the electric resistivity ρ reaches 425 μ Ω cm. The dependence of complex permeability u = u ′ − j u ″ on frequency f shows that the real part u ′ is more than 200 below 1.0 GHz and the ferromagnetic resonance frequency f r reaches 1.32 GHz, implying the promising for high-frequency application.