JPS6342354B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic bubble memory element used as a storage device for electronic computing devices and the like, and particularly to a bubble transfer path thereof.

The storage density of magnetic bubble memories has been increasing due to the recent increase in the amount of information and the demand for smaller devices. Under these circumstances, conventional 1M bit devices using a half-disk with a period of 8 μm or an asymmetric chevron pattern made of a soft magnetic thin film such as permalloy use a bar pattern at the corner of the minor loop, but with higher density The 4M-bit device that has been developed uses a wide gap pattern with a period of 4 μm as the basic pattern, so it is difficult to use a bar pattern in combination with it due to its operating characteristics. This is 8μm at the corner of the minor loop.
This is because if the periodic element pattern is reduced and used, the transfer margin will be significantly degraded. Therefore, conventionally, a corner pattern as shown in FIG. 3 has been used.

[Conventional technology]

Figure 3 is a diagram showing the 180° corner (counterclockwise) of a minor loop using a conventional wide gap pattern, where 1 is a wide gap pattern, 2,
3 indicates a corner pattern, and the arrows indicate the direction in which the bubble travels. For the corner patterns 2 and 3 of this 180° corner, a pattern in the shape of a bent pattern is used.

[Problem that the invention seeks to solve]

In the case of the above structure, the shape of the point P of the corner pattern 3 shown in FIG. 3 becomes sensitive to process fluctuations, and bubbles disappear at the Q portion.
Therefore, as shown in the characteristic diagram of FIG. 4, there is a problem in that the transfer margin deteriorates on the high drive, high bias side, and the variation between loops increases as shown by diagonal lines.

[Means for solving problems]

The present invention provides a magnetic bubble transfer path that solves the above problems, and its means connects a first transfer path using a soft magnetic thin film pattern and a second transfer path parallel to the first transfer path. , in a corner pattern consisting of two patterns in which the bubble transfer direction is changed by 180° counterclockwise, the ends of the bar pattern-shaped pieces of the two corner patterns approach each other at an angle of about 90°, and , the end of the pattern of the first transfer path approaches the end of the pattern-shaped piece of one of the two corner patterns at an angle of about 90°, and the end of the pattern of the first transfer path approaches the end of the pattern-shaped piece of one of the two corner patterns, The ends of the two pattern-shaped elemental pieces are connected to the second transfer path by the same connection method as the connection method between the patterns forming the second transfer path, and the two corner patterns are connected to the bar pattern, respectively. A piece of shape,
This is achieved by a magnetic bubble transfer path that is characterized by consisting of an element piece with a wider pattern width than that of the magnetic bubble transfer path.

[Effect]

The above-mentioned magnetic bubble transfer path uses two patterns, each consisting of a bar pattern piece and a wider pattern piece, and is connected in the same way as the straight portion, thereby suppressing variations due to process fluctuations. can.

〔Example〕

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention as a plan view. In the figure, 10 is a first transfer path, 11 is a second transfer path, 12 and 13 are corner patterns,
A and B are bar pattern pieces of corner patterns 12 and 13, 14 is the last pattern of the first transfer path, C is a piece of the final pattern of the first transfer path, 1
5 indicates the first pattern of the second transfer path, D indicates a segment of the first pattern of the second transfer path, and arrows indicate the direction of bubble travel.

In this embodiment, as shown in FIG.
Two corner patterns 12 and 13 are used to connect the 0 and second transfer path 11 and change the transfer direction of the bubble by 180° counterclockwise. It consists of pieces A and B, and pieces E and F whose pattern width is wider than the pieces A and B.
the ends of which are close to each other at an angle of approximately 90° (indicated by θ in the figure). Also, piece A of corner pattern 12
The end of the elemental piece C of the last pattern 14 of the first transfer path approaches at an angle of about 90° (indicated by θ' in the figure). Furthermore, the elemental piece B of the corner pattern 13 approaches the elemental piece D of the first pattern 15 of the second transfer path in the same way as the connection method between the patterns forming the second transfer path (indicated by the angle β in the figure). (indicated by angle β' in the figure).

The characteristics of this embodiment configured in this way are shown in FIG. In the figure, the vertical axis represents the bias magnetic field, and the horizontal axis represents the drive magnetic field. Curves A and B represent variations in the upper limit of the transfer margin, and curve C represents the lower limit of the transfer margin. It can be seen from the figure that the variation in transfer margin (indicated by diagonal lines) is smaller than in the past.

〔Effect of the invention〕

As explained above, according to the present invention, by connecting the corner pattern and its transfer path as explained in FIG. It is possible to suppress bubbles from disappearing with the elemental piece D, and to obtain a good transfer margin with no variation between loops.

[Brief explanation of drawings]

FIG. 1 is a plan view showing an embodiment of the magnetic bubble transfer path of the present invention, FIG. 2 is a view showing the characteristics of the magnetic bubble transfer path of the present invention, and FIG. 3 is a plan view showing a conventional magnetic bubble transfer path. 4 are diagrams showing the characteristics of a conventional magnetic bubble transfer path. In the figure, 10 is the first transfer path, 11 is the second transfer path, 12 and 13 are corner patterns, 14 is the last pattern of the first transfer path, and 15 is the first pattern of the second transfer path. Each is shown below.

Claims (1)

[Claims] 1 In a corner pattern consisting of two patterns that connect a first transfer path using a soft magnetic thin film pattern and a second transfer path parallel to this, and change the bubble transfer direction by 180° counterclockwise, The ends of the bar pattern-shaped pieces of the two corner patterns approach each other at an angle of about 90°, and
The end of the pattern of the first transfer path approaches the end of the pattern-shaped piece of one of the two corner patterns at an angle of about 90°, and The ends of the pattern-shaped pieces are connected to the second transfer path by a connection method equivalent to the connection method between the patterns forming the second transfer path,
A magnetic bubble transfer path characterized in that each of the two corner patterns is composed of a piece having the bar pattern shape and a piece having a pattern width wider than the bar pattern.