MAGNETO-RESISTIVE SENSOR, MAGNETIC HEAD USING THE SAME AND MAGNETIC RECORDING AND REPRODUCING DEVICE

摘要

PROBLEM TO BE SOLVED: To secure high sensitivity and high stability in a magneto-resistive sensor using a magneto-resistive sensor film of a GMR effect film or a TMR effect film and a magnetic flux guide. SOLUTION: Magnetization of the magnetic flux guide 10 and a first ferromagnetic layer 22 which is a free layer of a GMR or TMR effect sensor film are bonded anti-ferromagnetically through a non-magnetic intermediate layer 21. Since the practical magnetization quantity at a part where the magneto- resistive sensor film is disposed is reduced, thereby increases an angle of magnetization of the first ferromagnetic layer 22 rotated by the magnetic field guided by the magnetic flux guide 10, high sensitivity can be obtained. By further providing a longitudinal bias applying layer 33 to the magnetic flux guide 10, a longitudinal bias magnetic field is applied also to the first ferromagnetic layer 22 bonded anti-ferromagnetically to the magnetic flux guide 10, thereby suppresses the Barkhausen noise of both the magnetic flux guide 10 and the first ferromagnetic layer 22.