Effect of annealing field orientation on giant magneto-impedance in Co-based amorphous ribbon

摘要

Giant magneto-impedance(GMD has attracted much attention because of their importance for applications in magnetic sensors and heads for recording. In ribbon geometry, GMI is understood as the effect of magnetic field on the transverse permeability associated to the ac longitudinal current. The permeability depends on domain-wall motion and magnetization rotation processes and the easy-axis orientation. A phenomenological model relating the domain structure and magnetization processes to the transverse permeability and MI response has been proposed, where the effect of easy-axis orientation on MI profile was addressed. In order to control easy-axis orientation of amorphous ribbons, transverse annealing has been widely used. However, there are no detail experimental works on the field-anneal angle dependence of MI. In this paper, we present the variations of GMI profile in field-annealed amorphous ribbons at different angles to ribbon axis and compare those with the variations of transverse susceptibility profile obtained from a phenomenological single domain model.