Abstract: A magnetic bubble memory device comprises a bubble propagation path defined by a wide-gap pattern. This bubble propagation pattern has a geometry which is favorable for gaining an increase in density and which can provide a high propagation characteristic.

Abstract: A magnetic-bubble memory device having a bubble propagation track, defined by patterns of magnetically soft material, along which magnetic bubbles propagate in response to an in-plane rotating magnetic drive field. The bubble propagation track has a first track and a second track interconnected by a turn and defined by known hook-shaped wide-gap patterns or by modified wide-gap patterns. The turn includes a crooked bar-shaped pattern. An end portion of the last pattern of the first track is positioned opposite the inner edge of the crooked bar-shaped pattern, and an end portion of the crooked bar-shaped pattern is positioned adjacent to the first pattern of the second track. Such a bubble propagation track makes it possible to realize a 4 .mu.m period, 4 Mb bubble memory.

Abstract: A magnetic bubble memory device comprises minor loops for the storage of information and a major loop operably associated with the minor loops through gates, the minor loops being defined by an ion-implanted pattern and the gate portions of the major line being defined by patterns of magnetically soft material. This construction makes it possible to provide a high storage density and superior gate operating margins.

Abstract: A magnetic-bubble memory device comprising a bubble propagation path defined by patterns of magnetically soft material, along which magnetic bubbles propagate in response to an in-plane rotating magnetic drive field. The bubble propagation path has a first track and a second track and a connection for interconnecting the first track and the second track. The first track is defined by conventional propagation patterns, and the second track is defined by known hook-shaped wide-gap patterns or modified wide-gap patterns. The connection includes a connection pattern having one end portion arranged with respect to the terminal pattern of the first track in the same constructional relationship as that between the successive patterns of the first track and another end portion arranged with respect to the terminal pattern of the second track in the same constructional relationship as that between the successive patterns of the second track. Such a bubble propagation track makes it possible to realize a 4 .mu.

Abstract: A magnetic bubble domain swap gate circuit (28) for use with a magnetic bubble element having an information transmission line along which magnetic bubble domains are transferred and an information storage loop in which magnetic bubble domains are stored, wherein a magnetic bubble domain in the information transmission line can be transmitted to the information storage loop and a magnetic bubble domain in the information storage loop can be simultaneously transmitted to the information transmission line. The repetition period of the magnetic substance patterns which form the information transmission line, is greater than the period of the magnetic substance patterns forming the information storage loop.