JPS60160093A - Magnetic bubble generator - Google Patents

Abstract

PURPOSE:To improve the generation factor of magnetic fields and also to reduce the heat dissipation effect by forming a slot to a conductor pattern. CONSTITUTION:A hairpin-shaped conductor pattern 2 contains a rectangular heat dissipation fin 20 at its tip part, and a slot 22 is formed at the center part of the fin 20 in the direction parallel to a hairpin gap 21. A current pulse 3 is applied to an arm part of the pattern 2. Ths most of the current 31 passes through a part 32 held between the slot 22 and the gap 21, and only a part 33 of the current flows near a slot edge 22b. As a result, the temperature can be kept at a low level at the part of the fin 20.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a magnetic bubble generator in a memory device that uses magnetic bubbles as information carriers. More specifically, the present invention relates to a magnetic puzzle generator that nucleates magnetic bubbles using a local magnetic field generated by applying a current pulse to a conductor pattern.

(Prior art and its problems) A magnetic pulp element that uses magnetic pulp as an information carrier uses a magnetic bubble generator that generates magnetic bubbles depending on the presence or absence of information, and a magnetic bubble generator that transfers the generated magnetic bubbles to a predetermined position. The magnetic bubble transfer path is the most important functional element. Recent magnetic puzzle generators include, for example, T.J. Nelson (T.J.

In 1980, the Bell System Technical Journal (The Bell System Technical Journal) was published by
atem Tech-nieal Journal)
Vol. 29.1m2, pages 229 to 257, a hairpin-shaped conductor is placed in a magnetic puzzle transfer path consisting of an image-blind connecting circular pattern 7 where magnetization tends to concentrate in a specific direction of the rotating magnetic field. It has a patterned shape,
Further, by applying a current pulse to the aperture-shaped conductor, a magnetic bubble is generated by the sum of the local magnetic field generated by K and the local magnetic field from the concentrated magnetization.

On the other hand, when applying a current pulse to such a hairpin-shaped conductor, Japanese Patent Publication No. 57-36669 recommends placing heat dissipating fins at the tip of the hairpin conductor in order to reduce the effect of heat generation on the hairpin conductor due to the current. It is mentioned in the specification. An example of applying this to a magnetic bubble generator was published in 1980 by R.E. Fontana et al. in IE Transactions on Magnetics (I). Jg, T
rans, onMagn, ) No. MAG-16 No. 1
This is shown in FIG. 15 on pages 101 to 1105. The Nihyo-Creici Shonya magnetic bubble generator using such a conventional hairpin conductor pattern with radiation fins has the following problems.

The problems of the conventional magnetic bubble generator will be explained using FIG. Here, as a conventional example, the aforementioned Fontana
A magnetic puzzle transfer path made of permalloy made by K. will be explained by replacing the ion implantation transfer pattern I device made by Ne1aon. Even if the transfer pattern is replaced in this way, there is no essential difference in explaining the problem. The second part of the magnetic puzzle - the hairpin-shaped conductor pattern 2 for generating creativity is
It has a radiation fin 20 with a large surface area at its tip.

Furthermore, this hairpin-shaped conductor pattern is arranged such that the gap 21 overlaps the connecting cusp portion 10 of the connecting circular pattern 1 where magnetization is strongly concentrated in a predetermined direction of the in-plane rotating magnetic field horse 4. There is.

When generating magnetic bubbles, a current pulse 3 is applied to the hairpin-shaped conductor pattern 2. The current pulse flows within the conductor pattern as shown by the arrow 31, and at the tip of the hairpin conductor where the heat dissipation fin is located, the current pulse follows a short current path as shown by the arrow 32 near the gap 21; As the distance increases, the flow is distributed within the radiation fins as shown by arrows 33. The current component flowing inside the heat dissipation fins flows through the conductor gap 21 and the connecting cusp portion 1 where the magnetization of the magnetic bubble transfer pattern is concentrated.
00 Because it is further away than the overlapping part, 1 it makes almost no contribution to the generated magnetic field. 10 In other words, a strong magnetic field is required for the knee-crease generation of magnetic bubbles by current pulses. Despite this, due to the presence of the radiation fins, current components that do not substantially contribute to the generated magnetic field flow in a distributed manner within the radiation fins, thereby reducing the magnetic field generation efficiency of the applied current pulse. That is, in such a conventional example, a large current pulse is required to generate a magnetic puzzle.

(Object of the invention) The object of the present invention is to eliminate such conventional drawbacks,
It is an object of the present invention to provide a magnetic bubble generator having a hairpin-shaped conductor pattern with radiation fins that has good magnetic field generation efficiency and does not reduce the heat radiation effect.

Furthermore, by using the present invention, it is possible to provide a magnetic bubble generator with fewer malfunctions.

(Structure of the Invention) According to the present invention f14, a second creative magnetic bubble generator in which a conductor pattern is arranged in the magnetization concentrated part of the magnetic bubble transfer path provided on a thin piece of magnetic material capable of holding magnetic bubbles. In this case, a magnetic bubble generator is obtained, characterized in that one slot is provided in the conductor pattern.

(Detailed Description of Configuration) The present invention solves the problems of the prior art by adopting the above-described configuration. According to the principles of the present invention, the conductor pattern has an elongated groove-like non-conductor-forming portion c, which is referred to as a slot.

), when a current is applied to the conductor, the current cannot flow through that part due to the presence of the slot, but instead flows around it, and therefore the distribution of the magnetic field generated by the current changes due to the presence of the slot. It is based on the fact that the situation changes significantly.
It is something. On the other hand, there is almost no change in heat conduction within the conductor in the longitudinal direction of the rectangular slot within the conductor (depending on the presence or absence of the slot). Based on the above two principles, the present invention makes it possible to create a conductor pattern that achieves both a heat dissipation effect and an efficient magnetic field generation effect.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

Example 1 A first example of the present invention will be described with reference to FIG.

In the description of this embodiment, the presence of the magnetic material thin piece that holds the magnetic bubble and the magnetic bubble transfer pattern are not essential, so the description will be omitted in ζ. The hairpin-shaped conductor pattern 2 for generating magnetic bubbles has a rectangular heat dissipation fin 2o provided at its tip, and a rectangular heat dissipation fin 2o is provided at the center of the heat dissipation fin 2o.
A rectangular slot (opening) 22 is provided in a direction parallel to the hairpin gap 21 and the hairpin gap 21 . This hairpin conductor 2
A current pulse is applied in the direction shown by arrow 3. All of this current pulse flows through the arm portion of the hairpin-shaped conductor as shown at 31. In the radiation fin portion 20, this current cannot be freely distributed within the radiation fin due to the presence of the slot 22, and most of the current is distributed between the slot 21 and the hairpin gap (at the slot end 22), as shown at 32. ) in the vicinity of K. Then, only a small portion flows near the other slot end 22b of the slot pattern 22, as shown at 33. This current component 33 can be almost ignored if the slot is long enough, and if the slot is extended to the outer periphery of the heat dissipation fin 20 to form a notch that is connected to the outside, the current component 33 does not exist at all. (Dotted line in FIG. 2) As described above, due to the presence of the slot, the current component indicated by 32 is extremely large, and therefore the local magnetic field generated in the hairpin gap 21 is also large. In other words, the amplitude of the current pulse that generates a constant local magnetic field necessary for generating any creator 1 of magnetic bubbles may be small.

On the other hand, the heat generated by applying a current pulse to such a hairpin-shaped conductor pattern is maximum near the tip of the hairpin gap. On the other hand, as mentioned above, almost no current flows through the heat dissipating fins 20, and the generation of thermal heat in this part can be almost ignored, and the temperature is kept low. Therefore, the heat flow is parallel to the longitudinal direction of the slot from between the hairpin gap 21 and the slot end 22m, and the existence of the slot has almost no effect on the heat flow K, as mentioned above. I don't. That is, it means that the heat dissipation effect is not impaired in any way.

Therefore, by using the hairpin conductor pattern of this embodiment, a magnetic bubble generator that can be driven with a current pulse having a much smaller current amplitude and that has good heat dissipation and has a small temperature rise can be easily realized.

Embodiment 2 FIG. 3 shows a second embodiment of the present invention.

The shape of the heat dissipation fin 20 of the hairpin-shaped conductor pattern 2 of this embodiment is such that a large number of comb-like protrusions 20m are provided on its three sides to improve the heat dissipation effect. At the center of the radiation fin 2o, there is a hairpin gap 2, similar to the first embodiment. A slot 22 is provided parallel to the head. However, the effect on the current pulse is the same as in the first embodiment described above.

! ! JJL! - FIG. 4 is a diagram showing a third embodiment of the present invention.

The purpose of this embodiment is slightly different from that of the previous two embodiments, and the purpose of this embodiment is to reduce malfunctions of the magnetic bubble generator.
Multiple slots 22.23, 24.2 inside conductor button 2
5 is provided. A conductor button is provided in the cusp portion 10 where the magnetization of the magnetic bubble transfer pattern 1 is concentrated so that the slot end 23a of the first slot 23 is located. The second slot 22 extends in the same direction as the first slot, and its slot 1422m and the slot end 23m of the first slot 23 are opposite to each other. s0y)22-
Wide slots on both sides of 23 F 24* 25 fl'
, S''y are lined up on both sides of the opposing portion of F ends 22a and 23m.

When a magnetic bubble is generated, a current pulse 3 is applied to the conductor button 2. In a slot arrangement like this, there are several current paths, but if the width of the conductor button near the slot end 23b is narrowed, most of the current pulse 1lvc shown by the solid line arrow in the same figure will flow, and the path shown by the broken line arrow 33 and the path of the broken line arrow 33 will flow. Only a small amount of current flows in other paths. As a result, the slot end 23
aKhThe strong magnetic field generated by the magnetic field is
22m, 23bK have a magnetic field of opposite polarity, 22bI
/c has the same polarity as 23m, but an extremely weak magnetic field is generated.

Therefore, the magnetic bubble is a weak magnetic field component in the generation direction of the slot 230, and since a magnetic field of opposite polarity is generated in the cusp portion 10Fc second knee crease, the generated magnetic bubble can exist only in the vicinity of the slot end 23m. In the case of the conventional example shown in Figure 1, when a magnetic bubble occurs, a magnetic field of the same polarity as the bubble generation is generated all over the hairpin gap 21.

As a result, the generated magnetic bubbles extend indefinitely within the gap 21, which has the disadvantage of causing magnetic bubble generation malfunction. In this embodiment, such a malfunction cannot be avoided because the generated magnetic bubble can exist only at the slot end 23a.

(Effects of the Invention) As described above, by using the present invention, the amplitude of the current pulse for generating magnetic bubbles can be reduced, and a magnetic bubble generator with good current effect can be realized. Furthermore, when the present invention is used, a magnetic pull generator with fewer magnetic bubble generation malfunctions can be realized.Also, in the explanation of the present invention, an ion implantation button is used as a magnetic bubble transfer button. ,This is,
It goes without saying that the present invention is applicable to both permalloy battens and perforated two-layer conductor battens.

[Brief explanation of drawings]

Figure 1 shows a conventional puzzle generator, Figures 2 and 3.
4 and 4 are diagrams showing embodiments of the bubble generator of the present invention, respectively. In the figure, l is a transfer button, 2 is a conductor button, 3 is a current pulse, 4 is an in-plane rotating magnet 4.10 is,
11 is a cusp portion where magnetization is concentrated; 2 is a magnetic bubble transfer path;
0 is a conductor button for heat radiation, 20m is a protrusion button for heat radiation, 2
1 is a hairpin gap, 22, 23, 24.25 is a slot baton, 22b* 22b* 23m+ 23b+
31, 32, and 33 are arrows indicating paths through which current pulses pass.

Claims (1)

[Claims] The magnetization concentration part of the magnetic bubble transfer path provided on a thin piece of magnetic material capable of holding magnetic bubbles, and the second part with a conductor pattern arranged thereon.
1. A creative gas bubble generator, characterized in that the conductor pattern is provided with a slot.