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Publication numberUS3451793 A
Publication typeGrant
Publication dateJun 24, 1969
Filing dateDec 12, 1966
Priority dateFeb 12, 1966
Publication numberUS 3451793 A, US 3451793A, US-A-3451793, US3451793 A, US3451793A
InventorsAkira Matsushita
Original AssigneeToko Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Magnetic thin film wire with multiple laminated film coating
US 3451793 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

J1me 1969 AKIRA MATSUSHITA 3,451,793

MAGNETIC THIN FILM WIRE WITH MULTIPLE LAMINATED FILM COATING Filed Dec. 12, 1966 FIG. 4

Ni I

COERCIVE FORCE. HC 0 m 4 m TEMPERATURE INVENTOR.

' mum nm-susni-m Patented June 24, 1969 rm. Cl. Hillb 1/02 US. Cl. 29194 7 Claims This invention relates to wires coated with magnetic thin films (herein referred to as magnetic thin film wire) suitable foruse principally in memory elements and parametron elements. More particularly the invention concerns a new and improved magnetic thin film wire which is not subject to magnetostriction, has almost zero temperature coeflicient, and has extremely stable characteristics.

Magnetic thin film wires of the type referred to above consist of a conductor core wire coated with a magnetic thin film such as Permalloy applied on the conductor wire by electrodeposition. In general, since the magnetic thin film is affected by ambient temperatures, variations in temperature cause fluctuations in the magnetic characteristics, particularly the coercive force He, and, moreover, is readily subjected to magnetostriction.

It is an object of the present invention to provide a magnetic thin film wire which is almost completely free of magnetostriction, having a temperature coefficient close to zero, and having a remarkably stable characteristics.

Briefly stated, a feature of the magnetic thin film wire of the invention is that on the surfaces of a single conductor core wire, at least one thin film of an iron-nickel alloy of a compositional ratio of 50 percent of iron and 50 percent of nickel and at least one thin film of an iron-' nickel alloy of a compositional ratio of 21 percent of iron and 79 percent of nickel are deposited in laminate arrangement.

The nature and details of the invention will be more clearly apparent from the following detailed description with respect to preferred embodiments of the invention when read in conjunction with the accompanying drawing, in which like parts are designated by like reference numerals.

In the drawing:

FIGS. 1, 2, and 3 are fragmentary perspective views, with parts cut away, showing examples of magnetic thin film wire embodying the invention; and

FIG. 4 is a graphical representation indicating the relationship between temperature and coercive force in various components of the magnetic thin film wire according to the invention.

Referring to FIGS. 1, 2, and 3, there are shown examples of magnetic thin film wire embodying the invention. In each wire, a conductor core wire 1 is coated with at least one magnetic thin film 2 of an allow (hereinafter referred to as allow A) of 50 percent Fe and 50 percent Ni, and at least one magnetic thin film 3 of an alloy (hereinafter referred to as alloy B) of 21 percent Fe and 79 percent Ni.

FIG. 1 illustrates the most simple example in which the conductor core wire 1 is coated with one film 2 of alloy A which in turn is coated with one film 3 of alloy B. According to the invention, a plurality of alternate layers of films 2 and 3 may be deposited as illustrated in FIG. 2. I

Furthermore, an intermediate layer 4 of a conductor such as gold, silver, and copper or an insulating material can be interposed between magnetic thin films 2 and 3 as illustrated in FIG. 3. In this case, mutual interference between the magnetic thin films 2 and 3 can be reduced, and, by suitably selecting the material, thickness, and other features. of the intermediate film layer 4, magnetic thin film wires of various magnetization characteristics can be obtained.

The magnetization easy axes of the magnetic thin films 2 and 3 can be respectively selected as desired to be in the wire circumferential direction or the wire axial direction, it being possible to cause the two easy axes to be in the same direction or to be independently in different directions.

Alloy A (50% Fe, 50% Ni) and alloy B (21% Fe, 79% Ni) both have compositions which are not subject to magnetostriction and their respective temperature characteristics are as indicated in FIG. 4.

I have found that when a magnetic thin film wire is provided with composite layers of films of alloys A and B according to the invention, the temperature characteristic of the entire magnetic thin film wire becomes that as indicated by curve C in FIG. 4, whereby the temperature coefficient with respect to He is almost zero.

Moreover, since both of the alloys A and B have composition which, from the beginning, are not subject to magnetostriction, it is possible to produce a magnetic thin film wire which is not subject to magnetostriction, has practically zero temperature coefficient, and has extremely stable characteristics even when films of the alloys A and B are deposited in composite arrangement.

It should be understood, of course, that the foregoing disclosure relates to only preferred embodiments of the invention and that it is intended to cover all changes and modifications of the examples of the invention herein chosen for the purposes of the disclosure, which do not constitute departures from the spirit and scope of the invention as set forth in the appended claims.

What I claim is:

1. A magnetic thin film wire comprising a conductor core wire, at least one first film of an iron-nickel alloy containing 50 percent of iron and 50 percent of nickel, and at least one second film of an iron-nickel alloy containing 21 percent of iron and 79 percent of nickel, said first and second films being deposited to envelope the conductor core wire in alternate laminated layers.

2. A magnetic thin film' wire comprising a conductor core wire, at least one first film of an iron-nickel alloy containing 50 percent of iron and 50 percent of nickel, at least one second film of an iron-nickel alloy containing 21 percent of iron and 79 percent of nickel, and at least one intermediate film, said first and second films being deposited to envelope the conductor core wire in alternate laminated layers with said intermediate film interposed between adjacent first and second film.

3. The magnetic thin film wire as claimed in claim 2 in which the intermediate film is an electrical conductor.

4. The magnetic thin film as claimed in claim 2 in which the intermediate film is an electrical insulator.

5. The magnetic thin film wire as claimed in claim 1 in which all first and second films are caused to have magnetization easy axes in the wire axial direction.

6. The magnetic thin film wire as claimed in claim 1 in which all first and second films are caused to have magnetization easy axes in the wire circumferential direction.

7. The magnetic thin film wire as claimed in clainrl ""3-,-2-13,43'1 10/ 1965 Kolk etal. '340-174 in which either of the first and second films is caused to 3,328,195 6/1967 May 29-194 X have a. magnetization easy axis in a first direction and 3,350,180 10/1967 Croll 29--183.5 the other is caused to have a magnetization easy axis in a 3,375,091 3/1968 Feldtkeller 29--194 direction different from said first direction. 5

L. DEWAYNE RUTLEDGE, Primary Examiner.

References Cited E. L. WEISE, Assistant Examiner.

UNITED STATES PATENTS 2,853,402 9/1958 BlOiS 340-174 X 3,089,228 5/1963 Lynch 29-194 10 29 19s, 196.1, 196.6; 340 174

Patent Citations
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US2853402 *Aug 6, 1954Sep 23, 1958Blois Jr Marsden SMagnetic element and method for producing the same
US3089228 *Jul 21, 1958May 14, 1963Post OfficeMagnetic strip material
US3213431 *Dec 21, 1960Oct 19, 1965Ncr CoBilayer magnetic device operating as a single layer device
US3328195 *Jun 24, 1966Jun 27, 1967IbmMagnetic recording medium with two storage layers for recording different signals
US3350180 *Sep 30, 1963Oct 31, 1967 Magnetic device with alternating lami- na of magnetic material and non-mag- netic metal on a substrate
US3375091 *Mar 17, 1965Mar 26, 1968Siemens AgStorer with memory elements built up of thin magnetic layers
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3531783 *Aug 9, 1965Sep 29, 1970Sperry Rand CorpMultilayer magnetic wire memory
US3576552 *Dec 26, 1967Apr 27, 1971IbmCylindrical magnetic memory element having plural concentric magnetic layers separated by a nonmagnetic barrier layer
US3637443 *Nov 28, 1969Jan 25, 1972Motorola IncMethod for annealing magnetic wire
US3736576 *Nov 27, 1970May 29, 1973 Plated wire magnetic memory device
US3757754 *Sep 28, 1971Sep 11, 1973Milton VelinskyIgnition system
US3922651 *Oct 25, 1973Nov 25, 1975Kokusai Denshin Denwa Co LtdMemory device using ferromagnetic substance lines
US3994694 *Mar 3, 1975Nov 30, 1976Oxy Metal Industries CorporationComposite nickel-iron electroplated article
US3999174 *Sep 19, 1975Dec 21, 1976The United States Of America As Represented By The Secretary Of The NavyDiscontinuous chromium film for memory element
US4180699 *Jun 19, 1978Dec 25, 1979Gte Sylvania IncorporatedShielded electrically conductor
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US5736235 *Aug 6, 1991Apr 7, 1998Hitachi, Ltd.Magnetic recording medium having at least two magnetic layers with easy axes oriented in the same direction
US6713587 *Jun 27, 2002Mar 30, 2004Ppg Industries Ohio, Inc.Electrodepositable dielectric coating compositions and methods related thereto
US6824959Jun 27, 2002Nov 30, 2004Ppg Industries Ohio, Inc.Process for creating holes in polymeric substrates
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US7002081Aug 3, 2004Feb 21, 2006Ppg Industries Ohio, Inc.Single or multi-layer printed circuit board with recessed or extended breakaway tabs and method of manufacture thereof
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Classifications
U.S. Classification428/611, 365/139, 428/900, 428/671, 428/829, 307/403, 365/131, 365/133, 428/681, 428/928, 428/680, 365/171, 428/826, 428/931
International ClassificationH01B11/14
Cooperative ClassificationY10S428/928, Y10S428/931, H01B11/14, Y10S428/90
European ClassificationH01B11/14