JPS5990288A - Magnetic bubble transfer circuit - Google Patents

Abstract

PURPOSE:To improve the magnetic bubble transfer characteristics of a multiple- length period type transfer path by providing >=3 inflection points to the passage part of a magnetic bubble transfer pattern. CONSTITUTION:For example, three inflection points 1''a, 1''b, and 1''c are provided to the magnetic bubble transfer passage of a modified asymmetrical chevron pattern 1'' of a multiple-length period type and the distance L2 by which magnetic bubbles are transferred by a rotating magnetic field 2 becomes shorter than when one inflection point is provided. Consequently, an attraction pole is formed easily at the point 1''c and magnetic bubbles are transferred stably to improve the magnetic bubble transfer characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application of the Invention) The present invention relates to a field access type magnetic bubble transfer circuit comprising a ferromagnetic thin film pattern. In response to the changing demands for magnetic bubble transfer circuits that are most suitable for major lines (3 times longer periods or more), magnetic bubble transfer circuits have adopted multi-length period structures such as a folded minor loop system.

FIG. 1 is a plan view showing an example of a pattern constituting a conventionally used magnetic bubble transfer circuit constituting a minor loop. In the figure, numeral 1 is an asymmetrical chevron pattern made of a ferromagnetic thin film pattern, and numeral 2 is a rotating magnetic field that transfers magnetic bubbles (not shown) to predetermined positions of this pattern 1.

Further, FIG. 2 is a plan view showing an example of a pattern constituting a conventional quadruple-length cycle transfer circuit having the same magnification as that in FIG. 1. In FIG. 2, 1' is an asymmetric chevron pattern made of a ferromagnetic thin film pattern, and 2 is its rotating magnetic field. In these figures, as is clear from Figure 2,
By making the pattern period W2 of the asymmetric chevron pattern 1' four times longer than the pattern period W1 of the asymmetric chevron pattern 1 shown in FIG. When transferring along the shape of pattern 1', the distance L1 transferred on the slope of pattern 1' is four times longer than the same distance l in Fig. 1, so the bending point 1'b
There is a problem in that the transfer characteristics of the magnetic bubbles deteriorate because the magnetic bubbles become unstable, such as being unable to be transferred or disappearing, in the middle of the slope with the apex being . In other words, an asymmetrical chevron pattern or a leaf disk pattern has been used in conventional major lines with multiple length periods, but because the period is extremely large compared to the diameter of the transferred magnetic bubble, the magnetic By providing at least three bending points in the original feed path where the bubble becomes unstable and causes transfer failure, the formation of suction holes is facilitated.
The object of the present invention is to provide an 8-air bubble transfer circuit that facilitates the transfer of magnetic bubbles.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view showing an example of a pattern for explaining embodiments of the present invention in detail with reference to the drawings.

In the figure, 1〃 is a deformed asymmetric chevron pattern consisting of a ferromagnetic thin film pattern, and this pattern 1〃
The magnetic bubble transfer path has three bending points 1#a,
I II b and 1 pc are respectively formed.

In such a configuration, three bending points 1″a, 1
By providing "b" and "1"C, the distance L2 over which the magnetic bubble (not shown) is transferred along the transfer path by the rotating magnetic field 2 can be made shorter than the distance Ll shown in FIG. A suction pole is easily formed at 1″C, thus making it possible to stably transfer magnetic bubbles.

FIG. 4 is a plan view showing another embodiment of the pattern constituting the magnetic bubble transfer circuit according to the present invention.

In the same figure, a rod-shaped auxiliary bar pattern 3 made of a ferromagnetic thin film pattern is additionally placed on the opposite side of the modified asymmetric chevron pattern 1 shown in FIG. '' and this auxiliary bar pattern 3 constitute a transfer pattern having the same bit width W2 as the modified asymmetric chevron pattern 1'' shown in FIG.

According to such a configuration, the shape of the deformed asymmetric chevron pattern 1'' can be made small, so that the distance of the transfer path through which magnetic bubbles (not shown) are transferred along the deformed asymmetric chevron pattern 1'' by the rotating magnetic field 2 can be reduced. L8
can be made even shorter, thus making it possible to stably transfer magnetic bubbles in exactly the same way as described above.

FIG. 5 shows the conventional magnetic bubble transfer path shown in FIG.
This shows the transfer characteristics with the transfer path according to the present invention shown in FIGS. 3 and 4, where W2 of the transfer path is 23 pm, a magnetic bubble with a diameter of about 1.5 μm, and the frequency f of the rotating magnetic field 2 is
When driven under the condition of 100 KHz, as is clear from FIG. 5, in contrast to the conventional transfer characteristic shown by characteristic I, according to the modified asymmetric chevron pattern 1'' of the present application shown by characteristic ■, the magnetic bubble transfer characteristic is improved. was able to be significantly improved.

In the above embodiment, a case was explained in which an asymmetric chevron pattern was used as the magnetic bubble transfer circuit, but the present invention is not limited to this, and the present invention is not limited to this. Multiple length cycle method applied to patterns (3x length or more)
In the magnetic bubble transfer circuit of the present invention, by providing at least three bending points in the magnetic bubble transfer path of the magnetic bubble transfer pattern, an extremely excellent effect can be obtained in that the magnetic bubble transfer characteristics can be greatly improved.

[Brief explanation of drawings]

FIGS. 1 and 2 are plan views showing an example of a conventional magnetic bubble transfer pattern, and FIGS. 3 and 4 are one embodiment of a magnetic bubble transfer circuit according to the present invention, and magnetic bubble transfer showing another embodiment. FIG. 5 is a plan view of the pattern and a characteristic diagram showing the magnetic bubble transfer characteristics of the conventional and the present invention. 1.1'-・11@Asymmetric chevron pattern, 1'b
...Bend point, 1''--Deformed asymmetric chevron pattern, 1"a, 1"l), i''(sea/Bend point, 2...Rotating foundation, 3...Auxiliary Bar pattern. Fig. 1 He-W2-11 Fig. 5 Fig. 5 Oe

Claims (1)

[Claims] In a magnetic bubble transfer circuit formed by arranging magnetic bubble transfer patterns having a triple length period or more and having a large bit period at a predetermined interval, at least three bending points are provided in a magnetic bubble passage portion of the magnetic bubble transfer pattern. A magnetic bubble transfer circuit featuring: