Giant magnetoimpedance effect in sandwiched films

Abstract

The giant magnetoimpedance (GMI) effect in films with a sandwiched structure has been studied. FeNiCrSiB/Cu/FeNiCrSiB sandwiched films with a magnetic closed-loop structure were deposited onto a glass substrate by rf sputtering and then annealed at an optimum temperature. GMI ratios as large as 63% and 77% were obtained at 13 MHz in longitudinal and transverse fields, respectively. The ratios are almost twice as large as those obtained in FeNiCrSiB single films.