Dynamic magnetic information storage or retrieval – Record medium
Patent
1994-05-31
1996-06-25
Wolff, John H.
Dynamic magnetic information storage or retrieval
Record medium
360113, 360135, G11B 5706, G11B 500
Patent
active
055306098
ABSTRACT:
In a method for magnetically recording and reproducing signals in and from a magnetic recording medium via a thin film magnetic head, the recording medium has a magnetic layer of up to 0.5 .mu.m thick containing hexagonal ferromagnetic particles on a non-magnetic substrate, and the magnetic head includes a recording head whose gap adjacent portion is formed of a soft magnetic material having a saturation magnetic flux density of at least 0.7 T and a reproducing MR head. In one form, the magnetic layer has a surface roughness (Ra) of up to 5 nm, and a coercivity (Hc) of at least 1,100 Oe and a squareness ratio (S) of at least 0.70. In another form, the magnetic layer contains hexagonal ferrite and has a squareness ratio (S.perp.) of at least 0.70, and the magnetic head produces a reproduction output which is subject to zero-crossing detection without passing through a differential circuit.
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Fukuda Kazumasa
Kagotani Tsuneo
Koga Keiji
Nishizawa Akinori
Sakai Masanori
TDK Corporation
Wolff John H.
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