Magnetic head for perpendicular magnetic recording, head...

Details Magnetic head for perpendicular magnetic recording, head... Magnetic head for perpendicular magnetic recording, head...

2005-11-04

2008-12-09

Klimowicz, William J (Department: 2627)

Dynamic magnetic information storage or retrieval

Head

Core

C360S125120

Reexamination Certificate

active

07463449

ABSTRACT:
A pole layer incorporate a track width defining and a wide portion. A material forming the pole layer is an alloy whose major elements are iron and nickel. In the alloy, where the proportions of iron and nickel with respect to the total of iron and nickel are indicated as (100−M) weight % and M weight %, respectively, M is greater than 0 and smaller than or equal to 10. The internal stress of the pole layer is a tensile stress. The magnetostriction constant of the material forming the pole layer is positive. Where the anisotropy field of the pole layer is Hk (A/m), the magnetostriction constant of the material forming the pole layer is λ(×10−6), and the internal stress of the pole layer is σ (MPa), the value of Hk/(λ×σ) is greater than 0.01 and smaller than 0.2.

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(Author: K. Nakamoto et al.) “Single-Pole/TMR Heads for 100 Gb/in2Perpendicular Recording”, Journal of The Magnetic Society of Japan, vol. 27 No. 3, pp. 124-128 (2003).

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