METHOD FOR FORMING IMPEDANCE VALVE-TYPE MATERIAL AND MAGNETIC SENSOR USING THEREOF

摘要

PURPOSE: A method for forming impedance valve-type material and a magnetic sensor using the same are to form a material having impedance valve-type giant magneto impedance(GMI) characteristic usable for a micro magnetic head or micro sensor. CONSTITUTION: Magnetic substance is applied with a magnetic field at the atmosphere, so that a ferromagnetic layer is formed on a surface of the magnetic substance, thereby providing impedance valve-type GMI effect due to the bonding force between the magnetic substance layer and the ferromagnetic layer. The magnetic substance is any one selected from a group consisting of a magnetic thin film, an amorphous ribbon, a micro magnetic wire, Invar, magnetic crystal substance, and a combination thereof. The magnetic substance is annealed at about 380 deg.C during 1 to 8 hours, and the magnetic field is applied perpendicular to an axial direction of the magnetic substance.