Giant Magnetoimpedance in CoP Electrodeposited Films

Abstract

In the last few years there has been increasing interest in CoP electrodeposited alloys due to their excellent properties as soft magnetic materials (low coercivity and high permeability) in addition to the giant magnetoimpedance that they exhibit. More recently magneto-impedance (MI) effect has also been reported on thin films obtained by sputtering techniques. Most of the studies performed on MI have been carried out on wires or ribbons, where the sensor shape was conditioned by its manufacturing process. However these limitations disappear on samples grown by sputtering or electrolysis where the geometry of sensors can be defined by using photolithographic techniques. In this work we have studied the giant magnetoimpedance in CoP films. The influence of the thickness of ferromagnetic material, conductive material, the frequency and intensity excitement and the geometric shape of the samples has been investigated.