Metal working – Method of mechanical manufacture – Electrical device making
Patent
1991-05-13
1994-07-26
Hall, Carl E.
Metal working
Method of mechanical manufacture
Electrical device making
360126, 427131, G11B 542
Patent
active
053317289
ABSTRACT:
Magnetic thin film structures including a laminate of a layer of nonmagnetic material sandwiched between first and second layers of magnetic material and at least one edge closure layer of magnetic material disposed on a side edge of the laminate with the edge closure layer being in magnetic contact with the first and second layers of magnetic material. The edge closure layer eliminates magnetic edge closure domains and magnetic edge-curling walls in the yoke and poletip regions, or in a fluxguide of a magnetic recording head to substantially eliminate Barkhausen noise and wall network instabilities. Multiple layer laminates are also disclosed having a plurality of nonmagnetic layers each of which are sandwiched between layers of magnetic material and wherein the laminate includes edge closure layers that contact all the magnetic layers. Several methods are disclosed for fabricating the laminate. In one class of technique, the side edges are deposited together with a top layer in a single plating operation. In an another embodiment, the side edge closure layers are separately plated. Another embodiment provides for a layer of antiferromagnetic material deposited between the nonmagnetic layer and one of the magnetic layers to provide additional anisotropy.
REFERENCES:
patent: 3350180 (1967-10-01), Croll
patent: 4103315 (1978-07-01), Hempstead et al.
patent: 4320427 (1982-03-01), Bogan
patent: 4751598 (1988-06-01), Hamilton
patent: 4907113 (1990-03-01), Mallary et al.
Slonczewski et al., "Micromagnetics of Laminated Permalloy Films", IEEE Transactions on Magnetics, vol. 24, No. 3, May 1988.
Herman, Jr. et al., "Study of Field-Driven Wall-Configuration Conversions for Laminated Permalloy in the Easy-Axis State," J. Appl. Phys. 63(8), Apr. 15, 1988.
Herman, Jr. et al., "Edge-Curling-Wall Discontinuities and Interactions with Bloch Walls in Easy-Axis Permalloy" IEEE, vol. 24, No. 6, Nov. 1988.
Tsang et al., "Magnetics of Nonlaminated, Bilaminated, and Multilaminated Permalloy Stripes", J. Appl. Phys. 63(8), Apr. 15, 1988.
Romankiw, L. T. et al., Ext. Abs. Electro. Chem. Soc. vol. 89, Abs#300, pp. 430-431, Fall 1989.
Tsang et al., "Exchange Induced Unidirectional Anisotrophy at FeMnNi.sub.80 Fe.sub.20 Interfaces", J. Appl. Phys. 52(3), Mar. 1981.
Feng et al., "Permeability of Narrow Permalloy Stripes", IEEE, vol. MAG-13 No. 5, Sep. 1977.
Naksura et al., "Analysis of Domain Structure of Single Pole Perpendicular Head", IEEE, vol. MAG-21, No. 5, Sep. 1985.
Thompson et al., Laminated Films With Alternately Skewed Easy Axis for Magnetic Transducers, IBM Technical Disclosure Bulletin, vol. 19, No. 8, Jan. 1977.
Argyle Bernell E.
Arnoldussen Thomas C.
Beaulieu Thomas J.
Herman, Jr. Dean A.
Krongelb Sol
Hall Carl E.
International Business Machines - Corporation
LandOfFree
Method of fabricating magnetic thin film structures with edge cl does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of fabricating magnetic thin film structures with edge cl, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of fabricating magnetic thin film structures with edge cl will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1046309