Study On The Asymmetric Giant Magneto-Impedance Effect Of Composite Structure Magnetic Core

In this paper, we discusses the Fe73.5Cu1Nb3Si13.5B9and Fe76Si7.6B9.5P5C1.9two kinds of components composed of asymmetric giant magneto-impedance(GMI) effect of composite structure magnetic core. Includes the following two magnetic core, a kind of magnetic core was intermediated with wide linear GMI effect of FeCuNbSiB ribbon, both ends for contain hard magnetic phase FeSiBPC or FeCuNbSiB ribbon of the composite structure magnetic core of ribbon. Another kind of magnetic core was intermediate with soft magnetic performance preferably of FeCuNbSiB thin film, both ends for contain hard magnetic phase FeSiBPC thin film of the composite structure magnetic core of thin film. In order to be able to get asymmetric GMI effect, this paper study on the magnetic core of composite structure with ribbon and thin film, respectively. And the results are as follows:1. With wide linear GMI effect of FeCuNbSiB ribbon.(1) FeCuNbSiB ribbon was annealed under457MPa tensile stress at460℃temperature1h, the sample of GMI curve has wide linear, not only compared of other annealing temperature and tensile stress of GMI curve, but also has the most sensitive in nearly zero field. Which the maximum GMI ratio is590.7%, the linear interval of magnetic field is930.2A/m, the linear coefficient R is0.9945.(2) when FeCuNbSiB ribbon annealed under different tensile stress at460℃, which full width at half maximum of GMI curve with tensile tress increases, and presented the monotone increasing trend of approximate linear. 2. The longitudinally driven GMI effect of FeSiBPC films(1) FeSiBPC films were prepared by RF magneto sputtering which3.0μm thickness. When film samples annealing temperature higher than200℃,all can obvious show GMI effect, then the best annealing temperature is250℃,which using the longitudinally driven mode.(2) When the samples thickness for3.0μm, along with the increase of annealing temperature, which the full width at half maximum of GMI curve decrease gradually, sensitivity curve first increases then decreases. When annealed at300℃, the sensitivity maximum is2.06%/(A·m-1).(3) FeSiBPC films were prepared by RF magneto sputtering which1.5μm thickness. When FeSiBPC films of1.5μm thickness annealed at510℃, find that contain preferable hard magnetic phase among the films, which using the longitudinally driven mode.3. The longitudinally driven GMI effect of composite structure magnetic core.(1) Composite structure magnetic core were prepared by FeSiBPC ribbon and FeCuNbSiB ribbon with contained hard magnetic phase and FeCuNbSiB ribbon with provided wide linear GMI effect, respectively. With the longitudinally driven mode, the magnetic core of after magnetization showed asymmetric giant magneto-impedance(AGMI) effect phenomenon, respectively,which the maximum GMI ratio is284.95%and116.3%, the offset of GMI curve peak is93.02A/m and186A/m.(2) FeCuNbSiB and FeSiBPC films were prepared by open window sputtering film on the silicon wafer, then were composed of composite structure magnetic core. Which the FeCuNbSiB films thickness is3.0μm, the thickness of FeSiBPC films for1.5μm, respectively annealed under N2protection at300℃and519℃, then showed AGMI effect, which the maximum GMI ratio is92.96%, and the offset of GMI curve peak is11.62A/m.(3) Composite structure magnetic core of ribbon and thin film, the magnetic core of after magnetization showed asymmetric giant magneto-impedance(AGMI) effect, but there were no hysteresis.