Dynamic magnetic information storage or retrieval – Head – Core
Patent
1997-06-02
1998-09-01
Wolff, John H.
Dynamic magnetic information storage or retrieval
Head
Core
G11B 5147
Patent
active
058019103
ABSTRACT:
In a magnetic write head, the top pole piece reduces in width and cross-sectional area in a number of steps by providing a first wide tapered zone whose width progressively decreases at a first rate that is determined by side surfaces that are inclined at an angle of about 45 to 55-degrees, and providing a second narrow tapered zone whose width progressively decreases at a second lower rate that is determined by side surfaces that are inclined at an angle of about 5-degrees. This second narrow tapered zone may comprise the serial arrangement of three individual zones, a first of which whose width decreases at a rate that is determined by side that are inclined at about 4.7-degrees, a second of which whose width decreases at a rate that is determined by side that are inclined at about 5.7-degrees, and third of which whose width decreases at a rate that is determined by sides that are inclined at about 6.8-degrees. The pole piece's tapered zone terminates in a narrow and constant width pole tip. As a result, a long magnetic flux saturation zone is provided, wherein length is measured in a direction that extends toward the head's pole tip or write gap. A gap field versus write current (Bg-vs-Iw) curve is thereby provided having a high magnitude Bg and nearly flat slope Bg saturation region. The head is driven with an excess magnitude Iw, thus causing the head's Bg to increase rapidly to its optimum high magnitude, whereupon the increase in Bg abruptly stops. Better overwrite (OVW) is provided, less non linear transition shift (NLTS) occurs, and narrower read-back pulses are provided, at both the inner diameter (ID) and outer diameter (OD) of an associated magnetic recording disk.
REFERENCES:
patent: 5018038 (1991-05-01), Nakanishi
patent: 5134535 (1992-07-01), Mallary
patent: 5198949 (1993-03-01), Narisawa et al.
patent: 5373408 (1994-12-01), Bischoff et al.
patent: 5600519 (1997-02-01), Heim et al.
IEEE Transactions on Magnetics, vol. 32, No. 3, Sep. 1996, M.L. Mallary, "Effective Field Gradient Dependence on Write Field Rise Time".
Kubida William J.
Quantum Corporation
Sirr Francis A.
Wolff John H.
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