Dynamic magnetic information storage or retrieval – Head – Hall effect
Patent
1997-04-04
1998-10-13
Levy, Stuart S.
Dynamic magnetic information storage or retrieval
Head
Hall effect
360113, G11B 533, G11B 5127
Patent
active
058221590
ABSTRACT:
A thin-film magnetic head, a magnetoresistance effect magnetic head and an MR inductive head are disclosed. The thin-film magnetic head has one of thin-film magnetic cores stacked on a substrate and formed of two magnetic films and a non-magnetic film held between them, with a current flowing through the thin-film magnetic core in the direction of hard axis thereof. The magnetoresistance effect magnetic head has one of a pair of shield cores having a magnetoresistive element between them formed of two magnetic films and a non-magnetic film held between them, the magnetoresistive element being electrically connected to the shield core, with a sense current flowing through the shield core. The current flowing through the one shield core via the magnetoresistive element is preferably an AC of decrement amplitude for demagnetizing the shield core along with a DC sense current. Also, this current preferably flows in the direction of hard axis of the shield core so that magnetic properties of the shield core are stabilized or demagnetized by the magnetic field generated in the direction of easy axis. The MR inductive head has a second thin-film magnetic core as a common magnetic body of an MR head and an inductive head on one substrate, formed of two magnetic films and a non-magnetic film held between them, with a current flowing through the second thin-film magnetic core in the direction of hard axis thereof.
REFERENCES:
patent: 4195323 (1980-03-01), Lee
patent: 4356523 (1982-10-01), Yeh
patent: 5247413 (1993-09-01), Shibata et al.
patent: 5260653 (1993-11-01), Smith et al.
patent: 5311385 (1994-05-01), Schwarz et al.
Fukumoto Koji
Fukuyama Munekatsu
Sasaki Yasuo
Sekiya Tetsuo
Soda Yutaka
Klimowicz William J.
Levy Stuart S.
Sony Corporation
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