DE2159980A1 - Magnetic bubble area system - Google Patents

Description

PATENT ADVOCATE DIPL-ING.

HELMi'T OÖRTZ, 3o. November 1971 6 Fr ₃₁ WUr; am Mein 70 "/"

SdfeAfe π Gzs / Ha.

North American Rockwell Corporation, El Segundp, California, USA

Magnetulase area system

The invention relates to magnetic bubble areas and, more particularly, to a system with predetermined positions for Magnetic bubble areas in a strip or channel of magnetic area material.

Magnetic areas and the continuation of these areas in a magnetic Medium are well known and are described in U.S. Patent Nos. 3,460,116, 3,470,546, 3,5o8,225, and others. in the generally, these patents describe the movement of a region of the bladder with a single wall in a shift register using narrow metal patterns to indicate the position of the bubbles to control. The methods described in these patents attempt to minimize the repulsive or reciprocal forces between the individual bubbles by the

.be dried, individual bubbles from each other by a distance the is about 3 or more bubble area diameters. These procedures try to reduce the forces of interaction between the To essentially eliminate or "shrink" bubbles as much as possible.

In the parallel application to this application, a magnetic bubble range system disclosed comprised of one or more channels or strips of magnetic bubble region material

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a support substrate. Any number of individual bladder region channels can be interconnected or connected to a main channel. The movement of bubbles'"areas along a channel or strip is affected by the repelling or reaction forces between the bubble areas. Available in a channel, if a Blasc.obereich formed vorschoben or in the vicinity of another Blasüribereiches. The Movement of bubbles from a given channel into one of several possible adjacent channels to form a logic function can be controlled by the presence or absence of bubbles in one or more connected channels.

Another patent application describes a method that eliminates the presence of areas of bubbles near the edge of one magnetic film in a film substrate structure. The magnetic film is etched to make it smooth, well-defined To reach edge. The newly formed edge of the film repels the blister area, causing the blister area to appear in the remains substantially within the center of the strip or film or in the center of a filra disk.

It is an object of this invention to provide an improved magnetic bubble range system to accomplish.

It is another object of this invention to provide a magnetic bubble range system which has predetermined positions for Has bladder areas.

It is yet another object of this invention to provide a method for to create a magnetic bubble area system with predetermined positions for the bubble areas.

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~ 3 -

It is still another object of this invention to be complete Dependence on metal nuts for position control Avoid areas of blisters.

These and other objects of the invention are achieved by a magnetic bubble range system realized in which a film strip or film channel of bladder region material constraining at least one and has at least an unrestricted part, is preferably arranged on a t-m substrate. The bladder area from the edges of the constrained part in a Ugxpo repelled that the bubble area is within the non-restricted Partly is arranged «

In the following a Magnctblasenbereichssystem with Blasenberoichsn wiitf described, which are arranged in certain positions of equilibrium in a strip or channel from a film of magnetic bubble area material with a supporting substrate "In the strip there is at least a limited range that is not limited, the position of a bubble region in a , the associated bubble area. The position or arrangement of bubble areas in a strip in front of the bubble area film is determined by suitable distances between the delimiting strip parts.

Further advantages, features and possible uses of the invention result from the attached illustration of an exemplary embodiment as well as from the following description.

It shows:

Fig. 1 in a view partly in section and partly in Plan view of a structure in accordance with this invention;

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FIG. 2 is a cross-sectional view of the structure of FIG. 1,

Fig. 3 is a cross-sectional view of another embodiment; and

Fig. 4 is a cross-sectional view of a second alternative embodiment, ^ - shape"

As shown in Figures 1 and 2, an inocular substrate Io is subjected to a chemical vapor deposition process to deposit a thin film of magnetic bubble region material which is subsequently etched to create a stripe or channel 12. The deposition step is performed in accordance with U.S. Application No. 833,268 filed June 16, 1969.

The substrate 10 is preferably a monocrystalline garnet with a J-7Qc-O ₁ , ^, - composition, the J component of the layer composition being composed of at least one element selected from the following group: cerium, praseodymium, Neodymium, Promethium, Samarium, Europium, Gadolinium, ™ Terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Lanthanum, Yttrium, Calcium and Bismuth. The Q component of the Schiclitz composition is at least one of the following elements: indium, gallium, scandium, titanium, vanadium, chromium, manganese, rhodium, zirconium, hafnium, niobium, tantalum, aluminum, phosphorus, arsenic and antimony.

Examples of suitable substrate materials are Y _Q » ₅ , Gd _{2 55} »

35 ^Ga 5 ^O i2 ^and

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The filmstrip or channel 12 is of bladder area material preferably a single crystal garnet with a J ^ Qp-CL ~~ composition, wherein the J component of the film composition consists of at least one of the following elements -ordered: zerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, Dysprosium, Holmium, Erbium, Thulium, Ytterbium, Lutetium, Lanthanum, Yttrium »The Q component of the film composition becomes taken from the group that consists of: iron, iron and aluminum, iron and gallium, iron and indium, iron and Scandium, iron and titanium, iron and vanadium, iron and chromium, iron and manganese.

Preferred film materials are iron grenades, such as Y ^ Ga .. _o ^Fe 3.8 ° 12 ^{and Tb} 3 ^Fe 5 ° -i2 *

The iron garnet film substrate structure has a film with a given magnetostrictive constant and a given difference between the lattice constants of the film and substrate. This requirement is detailed in the concurrently filed U.S. Patent Applications No. 7oE158, No. 7oE158A and No. 7oE158B by Mee et al. While grenades are the preferable materials for the thin Film substrate, other oxide materials can also be used for the substrate, especially if the film is made of an orthoferrite material is formed.

The strip or channel 12 is preferably made by means of an etching process produced by either a photographic etching

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method is used, which is commonly used in the industry or by using an etchant such as hot phosphoric acid to form the edges 14 and 15 on the restricted portion 16, as well as the edges 15 and 19 on the non-restricted portions 2o

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to be used. While chemical etching is the preferred way of forming the channel or stripe 12, other methods can be used used such as injection etching, laser machining and the like.

Another embodiment of the channel 12 would be similar to that shown in Figure 1 except that the sides of the channel are not etched completely through the film thickness, to the substrate surface. In this case the channel would be formed by means of cuts which are etched in the film, the etch cuts extending in the film over a thickness which is between about Io and about 95 % of the total thickness of the film.

The width of constrained region 16, i.e., the distance between edges 14 and 15, is approximately preferably 1.5 to 2 times the diameter of the bubble area in the film. In a preferred embodiment, the width is the limited Region 16 approximately 0.015 mm (0.0006 inches) and the bubble diameter approximately o, oo76 mm (o, ooo3 inches). By making the restricted portion 16 wider than the bubble diameter, it becomes allows the bladder to pass from one non-delimited portion 18 of the stripe through one delimited region 16 to a second non- limited part 2o to hike.

The width of the non-delimited part 2o exceeds the width of the delimited part 16. Preferably, the ratio is Widths from the non-limited part 2o to the limited part 16 are of the order of 3 to 2, although this ratio is not this value is limited. In a preferred embodiment in which the restricted area 16 has a width of 0.015 mm (0.06 inches), the width of the unconstrained portion was 0.025 mm (0.01 inches).

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Blowing area before 22 are produced in a conventional manner by means of attaching suitable magnetic fields over the structure shown in the drawing. In general, the bubble n-areas have a size of, for example, in the case of substituted ice lines, approximately 0.076 ru: n (0.03 inches).

The blister areas 22 are repelled by the edges 14, 15, 18 and 19 of the film strip 12. Since the preferably width of the limited part 16 exceeds the diameter of the bubble region by a small value _r , the bubble regions 22 tend to be moved or pressed by the limited part 16.

from edges 14 and 1b
by thrusting them into the wider unrestricted part 20. The distance from a non-restrictive zone 2o between two restrictive zones 16 effectively arranges one or more bubble regions in the non-restrictive zone 2o. The non-restrictive zone has a length sufficient to accommodate one or more bubble areas therein.

The bladders 22 close from a non-restrictive part 2o a second or third non-restrictive part 2o displaced by a suitable arrangement of magnetic field gradients will. This is discussed in U.S. filings Case Nos. 7oE152, 7oEi53 and 7oE1-9.

The system described in this invention with two non-restrictive parts 2o, which are separated by a restrictive portion 16 may be 7 \ x a random access memory can be used. Multiple position shift registers can be made using three or more non-restrictive parts.

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Although a preferred embodiment has been described, numerous configurations can be made in accordance with this invention *

While the invention has been described with the aid of a strip or film of diagnostic bladder relief mounted on a substrate; as shown in Figures 1 and 2: this invention is also applicable to magnetic strips; applicable, which are arranged in inserts of the substrate, as shown in Fig. 3, or which are unfeeded by a material. which has ender magnetic properties; * "as shown in FIG.

As in Fig. 3 increases. ^e ^ n substrate 3o kit is provided with a mask 31 which has an opening. Using a suitable etchant, the substrate 3o is etched to create a depression or opening 3? - . The recess 32 is preferably filled with the strip 33 of magnetic blowing material, using chemical vapor deposition, as described in the discussion of FIG. The strip 33 also has a restrictive area which separates two non-restrictive areas _f as already discussed.

As shown in Fig. H , a layer consisting of a part 41 and a part 42 of a magnetic bubble region material is arranged on a substrate Ao. The part 41 has a lower magnetization level than the region 42. The structure shown in Fig. 4 can be made by depositing a film 41 on the substrate 40, after which an opening is etched in the layer 41 and then the material 42 is deposited in the opening . Another method of forming the part k2. is to diffuse an element into the film 41 or to .implant ions to form the part 42. elements

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like E »B. Gallii ", aluminum and the like, can be used to reduce the degree of ictmieti of the part 41 EU, the region which the for bsohreitunni; channel surrounds, that is the part ti2>

Fig. 1 and the Besühreiburg of the invention are mainly related. If the restrictive area employed in the stripe is limited primarily in the width of the stripe, the invention contains any geometric delimitation of the stripe yellow. The geometrical size can be used with regard to the depth or height of the film, the width of the film, or combinations thereof certain applications, v / ould it vorEUEiehen be to achieve the Begr & nzütiß- dui'Gh Vermine! ?? rnng d§r High or thickness of the film _t In other applications i'önnto one combination of a reduced film thickness and Pilribreite vorauzieh n & leg,

Claims (9)

- 1ο Claim -,;: Magnetlilasenberoiciissys'fcer'.i characterized by a substrate, a Καη ^ Ι of a film of Magpetblasenber-eichsffiateri ^ l connected to the substrate, and at least one restrictive part in the channel, and at least two tightly restrictive tollen in dea channel connected to the restrictive part, with a Blaser / bor e.Lch in the parts an equilibrium position in the non-restrictive; η part einnj him * 2. Magnetblaseneyt.tem, characterized by a substrate, a Strips of film of magnetic bubble area material are pre-bonded those with a substrate, and at least one restrictive part in the strip and at least two non-restrictive parts in the strip connected to the restrictive parts, a bubble area in the parts being in an equilibrium position in the non-restrictive parts. 3. magnetic bubble area system according to claim 2, characterized by zv / ei non-restrictive parts, which are separated by a restrictive part. 4. magnetic bubble area system according to claim 2, characterized by three or more non-restrictive parts, with each pair of non-restrictive parts by one restrictive Part is separated. 5 magnetic bubble preparation system according to claim 2, characterized in that that the width of the restrictive region part is at least the diameter of your bladder area. 209839/0999 BATH ORIGINAL 6. K3. £ ;; iGtulii .. ^r '? .Ifi> ReichG system according to claim 2, characterized in that; that the width of the restrictive region cnxteils z ',;i; .- oh3n is approximately 1.5 to 2 ntal of the diameter of the bladder region. 7. I'ia ^ iiefblanonbereichiSijystem according to claim 2, characterized in that the strip in a Einsenkurtg of the substrate on right .ist .ist. -t * 8. A method for controlling the position of equilibrium basitzt by a Blascnbereieh in a Blasenbereichssystero which is connected a strip of Blasenboreächsmaterlalfilms with a substrate, characterized by the steps of the image ens of a part in the strip, which has a limited width _s where the limited portion of the bladder area to a position in the strip associated with the restrictive part. 9. The method according to claim 8, characterized in that the restrictive part is produced by etching. 1ο «Method for controlling the equilibrium position of one Bladder area in a bladder area system that is suitable for use in a multiple digit shift register and that is a strip of bubble area material film associated with a substrate »characterized by the steps of forming at least two parts on the Strip that has a limited width, with the restrictive parts at least three non-restrictive parts separate in the strip. 209833/0999 BAD * OR! G! NAL Blank page