DEVICE FOR CLOSE-PACKED MAGNETIC DOMAINS

摘要

Digital information storage device comprising a control device connected to an information input, a non-magnetic substrate layer and two integral layers of magnetic material in which magnetic domains can be substained by a main magnetic field generator. Each of the layers comprise at least two magnetic crystalline sublattices with first and second magnetisations which are each time complementary within a layer and which have substantially opposed directions. A first and second means are provided for successively generating a series of magnetic domains in the first and second layers respectively and can form superposed magnetic domains pairs in the first and second layers and non-superposed magnetic domains which exhibits mutually repellant forces. A drive means is provided for driving a relative displacement between the first and second means and their generated series of magnetic domains. There is also provided a detector unit and a destruction unit for the magnetic domains. The first and second means are connected together for coincident driving of single magnetic domains or domain pairs, present in a row of the first shift register in a direction transverse to and out of the register, a control member being provided or activating the third means at instants whose intervals correspond to integer numbers of half periods of the drive in the first shift register for successive formation of rows of single magnetic domains or domain pairs in a direction along the first shift register in a two-dimensional domain array region which is situated adjacently thereto.