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PERPENDICULAR SINGLE POLE WITH REDUCED REMANENT FIELD

IP.com Disclosure Number: IPCOM000125138D
Publication Date: 2005-May-19
Document File: 3 page(s) / 34K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention provides means to generate magnetic anisotropy in the pole tip of the single write pole for perpendicular recording. This allows pole tip magnetization to be aligned parallel to the air bearing surface after write cycles thereby yielding less data erasure.

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PERPENDICULAR SINGLE POLE WITH REDUCED REMANENT FIELD

Net tensile stress provided parallel to TW direction in pole tip area. This is achieved by pl High compressive stress metal at the back edge of the pole. Tensile stress with positive Magnetostriction generates magnetic anisotropy parallel to the TW.

Net tensile stress provided parallel to TW direction in pole tip area. This is achieved by pl High compressive stress metal at the back edge of the pole. Tensile stress with positive Magnetostriction generates magnetic anisotropy parallel to the TW.

Plated back yoke, NiFe

Plated back yoke, NiFe

    Rh or Ta metal High Compressive stress

    Rh or Ta metal High Compressive stress

Tensile stress

Tensile stress

Pole tip

Pole tip

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Calculation: Shows placing 0.5 um thick metal generates About 50% additional stress. This assumes 1.0 GPa stress Metal placed at back edge.

Calculation: Shows placing 0.5 um thick metal generates About 50% additional stress. This assumes 1.0 GPa stress Metal placed at back edge.

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Magnetic anisotropy induced in Pole tip

Total tensile stress parallel to ABS = 1.5x10E9 dynes/cm2 Positive magnetostriction ~ 1.0x10E-5 Hk = 3 (Lambda) (stress)/M ~ 100 Oe The magnetic anisotropy in pole tip assures to obtain Longitudinal magnetization after write cycles to minimize Pole tip erasure problem.

The major claim is put high c...