Hitachi Metals, Ltd.

Kuniaki Yoshimura

Shinji Furuichi

Hideo Murata

Takeo Sasaki

Takehiko Sagara

Hideji Takahashi

Shuji Sudo

Shigekazu Ohtomo

Yuji Ueda

A manufacturing method that can manufacture small thin film magnetic head sliders with high dimensional accuracy and high manufacturing yield is disclosed. This manufacturing method uses 5 inch- or 6 inch-dia. substrate wafers having a thickness sufficient to keep wafer bending to a minimum level even after thin film magnetic head elements have been formed on it. On the front side surface of the substrate wafer formed are thin film magnetic elements. After a protective layer covered on the surface of the thin film magnetic head elements has been ground and/or lapped, the back side surface of the substrate wafer is ground and/or lapped to a thickness equal to a desired slider length.

Manufacturing process of thin film magnetic head sliders

A thin-film magnetic head includes an MR element serving as a reproducing element and a recording induction coil. The MR element is disposed between a lower magnetic pole and an intermediate magnetic pole. The recording induction coil is disposed between the intermediate magnetic pole and an upper magnetic pole. At least a portion of the upper magnetic pole in the vicinity of a recording gap is formed of a material having a high saturation magnetic flux density of 1.4 T or higher. The intermediate magnetic pole is formed of a material having a high resistivity of 80 .mu..OMEGA..multidot.cm or higher.

MR composite-type thin-film magnetic head having an upper pole with a

A thin film magnetic head has, on the rear side of one and the other magnetic poles 2, 5 in the shape of a film formed on a substrate, a coil layer around a connection between both the magnetic poles, and on the end side of one and the other magnetic poles, a magnetic gap layer 3 between both the magnetic poles, and a non-magnetic track width regulating member 8 is provided on the opposite sides of both the magnetic poles 2, 5 and the magnetic gap layer 3, wherein the end of each track width regulating member 8 is positioned between the ends close to and distant from the magnetic gap layer in the other magnetic pole, and the other magnetic pole 5 formed by plating covers partially at least a portion of the end of each track width regulating member, or the end surfaces close to and distant from the magnetic gap layer in the other magnetic pole 5 are not parallel to each other. Thus, both the magnetic poles 2, 5 in the gap portion are formed to have the uniform and small width with high precision, resulting in prevention of side-fringing.

Thin film magnetic head having a pair of magnetic poles formed on

The thin-film magnetic head comprises a gap layer, coil layer, insulating layer, and top magnetic pole layer stacked in sequence on the bottom magnetic pole layer, and a magnetic gap formed at the end position of the gap layer. The top magnetic pole layer is magnetically joined to the bottom magnetic pole layer over the whole width at the opposite position of the magnetic gap. All these enable an easy production of the thin-film magnetic head keeping the magnetic resistance of the magnetic circuit small and having a structure appropriate to a higher recording density.

Thin-film magnetic head having improved magnetic pole structure

A coated magnetic recording member for use in a magnetic encoder includes a non-magnetic substrate and a magnetic recording medium carried on the non-magnetic substrate. The magnetic recording medium of a magnetic film formed of a magnetic coating material which contains magnetic barium-ferrite powder. A magnetic encoder includes the magnetic recording member on which magnetic recording is conducted, and a magnetic sensor disposed in opposed relation to the magnetic recording medium.

Growing community of inventors

Mooka, Japan

Kuniaki Yoshimura