Sony Corporation

Kaoru Aoki

Katsumi Sakata

Heikichi Sato

Osamu Onodera

Atsushi Suzuki

Yoshito Ikeda

Tatsuo Kumura

Naoto Kojima

Akio Mishima

Masaya Kousaka

A magnetic head having a sliding surface () on which a magnetic recording medium is slid, a magnetic gap g formed in the sliding surface for exchanging information signals with the magnetic recording medium, a track width controlling portion for prescribing a track width Tw of the magnetic gap g, with the track width controlling portion being formed by abutting a pair of magnetic core halves () together, there being track width controlling grooves (to) formed in each of the magnetic core halves, metal magnetic films (to) provided in association with the magnetic gap g and with the track width controlling portion, and a groove () formed in at least one end of the magnetic gap g for extending substantially parallel to the sliding direction of the magnetic recording medium. A length L in &#x3bc;m between a first point of intersection P between the track width controlling groove () formed in one of the magnetic core halves () and one lateral edge of the groove () and a second point of intersection Q between the magnetic gap g and the other lateral edge of the groove is related with an intensity of the recording current I [mA] by L&#x2267;11.3&#xd7;ln I&#x2212;21.9. With the magnetic head, demagnetization produced in the recording track of the magnetic tape is prevented from being produced.

Magnetic head

A magnetic head having a sliding surface () on which a magnetic recording medium is slid, a magnetic gap g formed in the sliding surface for exchanging information signals with the magnetic recording medium, a track width controlling portion for prescribing a track width Tw of the magnetic gap g, with the track width controlling portion being formed by abutting a pair of magnetic core halves () together, there being track width controlling grooves (to) formed in each of the magnetic core halves, metal magnetic films (to) provided in association with the magnetic gap g and with the track width controlling portion, and a groove () formed in at least one end of the magnetic gap g for extending substantially parallel to the sliding direction of the magnetic recording medium. A length L in &#x3bc;m between a first point of intersection P between the track width controlling groove () formed in one of the magnetic core halves () and one lateral edge of the groove () and a second point of intersection Q between the magnetic gap g and the other lateral edge of the groove is related with an intensity of the recording current I [mA] by L&#x2267;11.3&#xd7;1nI&#x2212;21.9. With the magnetic head, demagnetization produced in the recording track of the magnetic tape is prevented from being produced.

A magnetic head shows a remarkably reduced eddy-current loss. The metal magnetic film of the magnetic core of the magnetic head has a multilayer structure obtained by laying alternately metal magnetic layers and insulating layers . The nonmagnetic film of the magnetic head that provides a magnetic gap is also made to have a multilayer structure obtained by arranging first films made of an insulating material, second films made of Cr and a third film made of Au as mentioned from the sides held in contact with the metal magnetic film

A method for manufacturing a magnetic transducer head in which a track width regulating grooves provided on both edges of a magnetic gap are filled by blowing a powder beam of nonmagnetic material having a very fine particle size to deposit the nonmagnetic material in the grooves. A pair of magnetic core members are bonded together to form a magnetic gap therebetween by providing a metal layer of a bonding surface of the core members and applying a pressure to the core members under an elevated temperature to cause a mutual diffusion of the metal to bond the core members together. Thus the magnetic transducer head can be made without using a high-temperature heat treatment.

Growing community of inventors

Miyagi, Japan

Kaoru Aoki