High permeability thin-film magnetic head and method of manufact

Details High permeability thin-film magnetic head and method of manufact High permeability thin-film magnetic head and method of manufact

1992-10-15

1995-01-17

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Magnetic materials

29603, 427130, G11B 531, H01F 4122

Patent

active

053823010

ABSTRACT:
A thin-film magnetic head is disclosed that includes a lower magnetic core and an upper magnet core formed on the surface of a substrate and connected together at a first end thereof, a magnetic gap is formed between the lower and upper magnetic cores at a second end thereof, and a coil-form electric conductive layer is located between the lower magnetic core and the upper magnet core. The lower and upper magnetic cores have a saturated magnetic flux density from 10,000 G to 18,000 G, while the magnetic permeability along the magnetic path of the magnetic head is 3,000 or higher at a frequency of 10 MHz. The unique characteristics of the magnetic head are obtained by heating an arrangement comprising the lower and upper magnetic cores, the magnetic gap layer, and the electric conductive layer to a temperature above 325.degree. C., and applying an external magnetic field greater than 0.01 kOe to the lower and upper magnetic cores to relax their magnetic anisotropy as the lower and upper magnetic cores are cooled during the manufacturing process.

REFERENCES:
patent: 4544421 (1985-10-01), Springer
patent: 5214840 (1993-06-01), Imagawa et al.

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