High sensitive detection of field-induced susceptibility modulation with circuit resonance

Abstract A high sensitive detection of reversible susceptibility in magnetic thin films was performed with an electric circuit resonant technique. A multilayer sample of [NiFe(100 nm)/Cu(10 nm)] 5 exihibits the most sensitive modulation effect among the fabricated samples. That is, the resonance frequency f r , was decreased with the bias field H b from 9.3 ( H b =0 Oe) to 8.6 MHz ( H b =6.0 Oe) at an exciting field H ex =70 mOe. The marked f r change can be associated with the field-induced susceptibility modulation in the soft magnetic thin film.