Magnetic recording medium and magnetic head assembly with a medi

Details Magnetic recording medium and magnetic head assembly with a medi Magnetic recording medium and magnetic head assembly with a medi

1997-11-24

2000-01-11

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record medium

360113, G11B 574, G11B 539

Patent

active

060142928

ABSTRACT:
A magnetic recording medium and a thin film planar magnetic head form an assembly. The magnetic recording medium of the assembly includes a magnetic coating having a residual magnetization value (Mr) and a thickness value (t) which together form a high product value (Mr)(t) which is preferably greater than about 1.8 memu/cm.sup.2. This coating also has a high coercive field value of Hc which is preferably greater than about 2,200 Oe. The ratio formed by dividing the (Mr)(t)product value by this coercive field value Hc((Mr)(t)/Hc) is preferably approximately 0.7.times.10.sup.-3 memu/cm.sup.2 /Oe or 0.8.times.10.sup.-3 memu/cm.sup.2 /Oe. The product of the (mr)(t) product value and the coercive field value Hc ((Mr)(t)(Hc)) is preferably greater than approximately 4000 Oe.times.memu/cm.sup.2. The overall effect of the present invention is to provide the magnetic medium coating with an enlarged hysteresis loop as compared to that conventionally used with such assemblies so that there is a resulting increased amplitude reading signal with an improved signal to noise ratio.

REFERENCES:
patent: 5434733 (1995-07-01), Hesterman et al.
patent: 5572392 (1996-11-01), Aboaf et al.
patent: 5750270 (1998-05-01), Tang
patent: 5815343 (1998-09-01), Ishikawa
patent: 5830584 (1998-11-01), Chen
D. D. Tang, et al., Journal of Applied Physics, vol. 75, No. 10, part 2B, pp. 6397-6399, "Omega Head-An Experimental 120-Turn Inductive Head", May 15, 1994.
Xiaodong Che, et al., Journal of Applied Physics, vol. 73, No. 10, part 11A, pp. 6004-6006, "Study of Magnetic Recording Transitions At Very Low Flying Heights", May 15, 1993.

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