JPH04505520A - magnetic bubble reader - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] Magnetic bubble successive device field of invention The present invention relates to digital memories using magnetic storage elements, and more particularly to magnetic bubbles. The present invention relates to a file succession device.

Conventional technology Magnetic bubble successive device known in the art (JP-A-60-3755 0) mounts the magnetic bubble expansion element and the magnetoresistive readout element in the vertical direction It has a magnetic uniaxial layer. This magnetic bubble expansion element is in the form of a half-loop conductor. It is intended to transform magnetic bubbles into striped domains.

The current flow in the conductor creates a magnetostatic trap in the magnetic uniaxial layer in the half-loop area. produce.

If there is a break in the half-loop, the result is that the magnetostatic trap The magnetic bubble expands to the outside without being concentrated inside, and to the opening side of the half-loop. tension is promoted.

As a result of this, the stripe domains are converted into magnetic bubbles after the current is interrupted. The area is not precisely defined, which undermines the reliability of the series.

Magnetic bubble successive device (LIS-A-4412) which is separately known in the art 307) mounts a magnetoresistive continuous element and a magnetic bubble expansion element in the vertical direction. This latter (magnetic bubble expansion element) is electrically connected to each other. Two π-type conductors insulated are separated at two points to form an extended loop. There is.

The current in the conductor creates a magnetostatic trap in the magnetic axle layer in the loop area .

Since this loop is divided in two places, the magnetostatic trap is placed in this divided area. A magnetic field that is not constrained and expands indefinitely toward the breaking point after reaching the loop area. It becomes a bubble.

After the current is interrupted, the stripe domain is located outside the expansion element, at the broken part of the loop. area may turn into bubbles, which may damage the reliability of the magnetic bubble series device. Sleeping.

Disclosure of invention The object of the present invention is to provide a magnetic bubble expansion element that ensures a closed magnetostatic trap. We provide a magnetic bubble successive device with characteristics, thereby increasing the reliability of the magnetic bubble successive device. It is to improve one's sexuality.

This is a magnetic bubble successive device that has a magnetic uniaxial layer with magnetic bubbles. The layer is in the form of a magnetoresistive sequence element and two conductors electrically insulated from each other. This is accomplished by vertically mounting the magnetic bubble expansion element. Main departure According to Akira, the conductor of the magnetic bubble expansion element has a rectangular shape, and the pair of conductors Mount the conductors vertically so that their projections onto the magnetic uniaxial layer coincide with each other are doing. Also, the section removed from the long side of one conductor and the opposite a section removed from the long side of the second conductor; The projections onto the surface of the magnetic axle layer perpendicular to the long side of each conductor with respect to the symmetry axis of It is configured to Additionally, a boundary for each conductor section is provided, which boundary is It is parallel to the long side of the conductor, coincides with the axis of symmetry of each conductor, and its length is It is kd. where k is a coefficient greater than 1 and d is the diameter of the magnetic bubble .

Preferably, the section removed from this conductor is rectangular.

The present invention provides a memory that is characterized by high speed, small size, low power consumption and ease of manufacture. enables the production of

Drawing overview Other objects and advantages of the present invention will be discussed in connection with the accompanying drawings. It will become clear from the detailed description of the preferred embodiment below. here, FIG. 1 shows the design of the magnetic bubble successive device according to the present invention, and FIG. 2 shows the design of the magnetic bubble successive device according to the present invention. 1 shows a cross-sectional view along line II=II in FIG. 1, FIG. 3 shows a cross-sectional view along the line III=III of FIG. 1 according to the present invention.

Preferred embodiments of the invention This magnetic bubble successive device is equipped with a magnetic axle layer 1 (Fig. 1) having magnetic bubbles. An insulating layer 2 is mounted on the surface of the layer 3, and a magnetic bubble expansion element 3 is mounted above it. magnetic A series of resistive elements 4 are separated from each other by an insulating layer 5 and arranged in the vertical direction. magnetic The air bubble expansion element 3 includes a rectangular conductor 6. Insulating layer 7 and rectangular conductor 8 are in vertical direction It is designed to be placed in The rectangular conductors 6, 8 have an axis of symmetry 9 of these conductors. , 10 are mounted in the vertical direction so that their projections onto the surface of the magnetic uniaxial layer 1 coincide with each other. has been recorded.

Sections 11.12 are taken outwardly from each opposite long side of the rectangular conductor 6.8. removed.

These sections are preferably rectangular in shape, since this shape Concerning the projection of boundaries 15, 16 of Section 11.12 onto the surface of magnetic uniaxial layer 1 This is because it gives the largest matching area. This provides a maximum length of closed magnetostatic As a result, the efficiency of the magnetic bubble expansion element 3 is improved. ing.

Sections 11.12 are perpendicular to the long sides of the rectangular conductors 6, 8, and the sections The projections of the symmetry axes 13, 14 onto the surface of the magnetic uniaxial layer 1 coincide with each other. section Boundaries 15.16 of conductors 11.12 are parallel to each long side surface of conductors 6 and 8, and coincides with the axis of symmetry 9.10. The length of each section 11.12 is kd, 20 is a proportionality coefficient greater than 1, and d is the diameter of the magnetic bubble.

The magnetoresistive sequence element 4 is provided with terminals 17, 18 at which an output voltage U is generated. , this voltage U defines the existence of magnetic bubbles and realizes their successive appearance.

A constant bias magnetic field H is applied to the magnetic uniaxial layer 1.

(The source of the bias magnetic field H is not shown) This rectangular conductor is connected to the current pulse driver. It is connected.

(not shown).

Figure 2 is a view of Figure 1 taken along line II=II away from section 11.12. It is a cross-sectional view of the designed layout, showing the distribution of magnetic lines of force around the conductors 6 and 8.

Figure 3 is Figure 1 along line III = III in the area of section 11.12. is a cross-sectional view of the design layout of 6.8, showing the distribution of magnetic field lines around conductor 6.8 in this area. are doing.

This magnetic bubble successive device spreads magnetic bubbles in stripes within the magnetic bubble expansion element 3. It functions by converting into the domain, and detects the magnetization of the magnetoresistive element 4. The length of this magnetic stripe domain to flip along the entire length of the continuous element. is made equal to the length of the magnetoresistive continuous element 4. This is due to the change in resistance R of element 4. , and then generated by the resulting successive element 4. Changes in output voltage are recorded.

This is the current to the magnetic bubble expansion element 3, which consists of two rectangular conductors 6, 8. Requires pulse supply. This current causes the magnetic bubble to become a striped domain. In the area of the magnetic bubble expansion element 3 deep enough to expand, the magnetic uniaxial layer The value must be sufficient to create a magnetostatic trap in l, thereby causing the magnetic Reversal of magnetization detection is applied to the resistive element 4 to ensure successive generation of magnetic bubbles.

In a preferred embodiment, the rectangular conductors 6, 8 of the magnetic bubble expansion element 3 are vertically so that the projections of the symmetry axes 9 and 10 onto the surface of the magnetic uniaxial layer 1 coincide with each other. It is placed in the opposite direction. As a result, the flow through these conductors is of different magnitude and in opposite directions. The conduction of a current 1+, It in the direction generates a magnetic field around the conductor. Magnetic field lines H', H’z component and H″22 component along the Z axis, as shown in Figure 2 as H” They are in opposite directions and cancel each other out.

This result is a state in which there are no magnetostatic traps in the magnetic axle layer 1. Conductor 6.8 is different Since it is separated from the magnetic uniaxial layer 1 by a distance, the local magnetic field is completely suppressed in the magnetic uniaxial layer 1. Complete cancellation requires different magnitudes of current in conductor 6.8. conductor 8 is further away from the magnetic axle layer 1 and therefore requires a larger current.

Conductors 6, 8 are provided with sections 11.12 (Fig. 3) and the design layout of these cut-outs is As a result, the lines of magnetic force H'3. H”, as shown in Figure 3. Thus, the same current pulse that generates the magnetic field is obtained and at the same time the magnetic field around the conductor 6.8 is The same holds true for versions 11 and 12. The component of the magnetic field parallel to the Z axis is the vector H ’Zl+H’ z1 and in the same direction as Section 11.12 Boundary 15.16 , and opposite to the bias field H, thus creating a magnetostatic trap.

On the side of the conductor 6°8 opposite the boundary 15.16 of section 11.12, the magnetic field formation Minute H'In　H''2. is oriented in one direction, coinciding with the direction of the bias magnetic field H. There is. This results in a strong magnetic field strength and therefore no magnetic traps are generated.

The length of this Section 15.16 is such that it creates a striped domain of length kd. , where k is greater than 1, d is the diameter of the magnetic bubble, and the magnetoresistive It is possible to create the required amount of change ΔR in the resistance of the resistive element 4.

In the general case, the output voltage U of the magnetic bubble successive device is exactly proportional to ΔR, It depends on the length of the magnetoresistive element 4, which length influences the effect of magnetization sensing reversal. equal to kd. Therefore, the relationship is U~ΔR-kd.

In this way, the A magnetostatic trap is created in the vicinity of sections 11, 12, and these sections 11. The possibility of unlimited magnetic bubble expansion beyond the 12 boundaries is eliminated.

As a result, when the current is turned off, the striped domains form sections of rectangular conductors 6 and 8. are converted into magnetic bubbles within the magnetic axle layer 1 of the tubes 11,12.

In order for the magnetic bubble successive device to work, the area must be emptied to receive the next bubble. It is essential that you take it. The area where the bubble progresses is shown in section 11. Since bubbles are defined in a single area in 12 areas, it is easy to remove bubbles, and this is exactly what it is. improves the reliability of the performance of the magnetic bubble series device.

Using methods known in the art, the magnetic bubbles are aligned vertically in the device. It is propagated into the area of section 11.12 towards the nominal axes 9,10. after that , a magnetic field H″21 (the first 3) is supplied to the conductor 8. At the same time, the conductor 6 A reverse field H'21 is generated from section 11 opposing the bias magnetic field H. A polar current I2 is supplied. Current 1. , L are produced by conductors 6 and 8 (Fig. 2). Complete mutual cancellation of the magnetic fields H'z, H''2 created in section 11. is chosen to be given outside of 12.

On the other hand, in the range of these sections, the magnetic fields H′21 and H″21 ( FIG. 3) is applied and opposes the bias magnetic field. Magnetic bubbles are described in section 11. 12 along the boundary 15.16E into a striped domain. striped The main thing is to reverse the magnetization detection of the magnetoresistive element 4 with the help of the leakage magnetic field, and This causes a decrease in the resistance R of this element. striped domain By the edges of sections 11.12 of the magnetostatic traps or conductors 6, 8 located This trap collects within the space of these sections to It will be inside. Both the larger current H, , H2 and the longer operating time does not lead to unlimited expansion of striped domains beyond version 11.12.

The design arrangement of the magnetic bubble successive device of the present invention is such that the position of the magnetic bubbles is in the section area. This improves the reliability of the device's performance.

industrial applicability The present invention relates to a storage device, a robot device, and a numerically controlled machine tool.

Effectively used in the field of aerospace engineering 2 communication equipment and personal computer equipment. can be used.

Claims (2)

[Claims] 1. comprising a magnetic bubble and a magnetoresistive readout element (4); The magnetic bubble expansion element (3) in the form of conductors (6, 8) is mounted vertically. In a magnetic bubble readout device comprising a magnetic uniaxial layer (1) that The conductors (6, 8) of the expansion element (3) have a rectangular shape, and the symmetry of the conductors is The projection of the axes (9, 10) onto the magnetic uniaxial layer (1) the conductor (8), and the conductor (8) facing the long side. and the magnetic bubble expansion element (3) is mounted on the section (1). 1, 12), and the axis of symmetry (13, 14) of said section is aligned with said conductor (6, 8). ), and the projection of the symmetry axis onto the magnetic uniaxial layer (1) is perpendicular to the long side surface of the magnetic uniaxial layer (1). Furthermore, the magnetic bubble expansion element (3) is parallel to the long side surface of each conductor. a boundary (15, 16) of said section (11, 12); coincides with the axis of symmetry of the conductor (9, 10) and of each section (11, 12). The length is kd, where k is a proportionality coefficient greater than 1 and d is the directivity of the magnetic bubble. A magnetic bubble reading device characterized by having a diameter. 2. Sections (11, 12) of said conductor (6, 8) have a rectangular shape. A magnetic bubble reading device according to claim 1.