Abstract: A method of manufacturing and using a magneto-optic device is provided in which a non-magnetic substrate material is utilized to support a laminate formed of at least two layers of magnetic material having certain magnetic and optical properties optimized in one layer and certain switching properties optimized in another layer. The laminate layers are exchange-coupled at their interface to permit the propagation of a magnetic domain wall through the interface from the switching optimized layer to the optically optimized layer so that the direction of magnetization and Faraday rotation of the entire multilayer magnetic material laminate can be reversed through application of an applied external magnetic field having a relatively small threshold value. A modified region of decreased anisotropy material is provided within the switching optimized layer to reduce the switching threshold field for the magneto-optic device to a fraction of the low threshold of the magnetic material of the switching optimized layer.

Abstract: A method for producing a large area of single domain magnetic bistability is shown including the steps of selecting the properties of films of magnetic materials such that the saturation field (H.sub.s) that is less than the value of the anisotropy field (H.sub.k) reduced by the value of a demagnetization factor (4.pi.) times the magnetization value (M.sub.s) as stated in the equation:H.sub.s <H.sub.k -4.pi.M.sub.s.Isolated areas are created in these films by means which do not introduce changes in the magnetic properties, such as stress anisotropy effects. Large area stable domains exist in material whose measured magnetic properties meet this relationship independent of temperature and without a requirement for a magnetic bias.

Abstract: A method of manufacturing and using a magneto-optic device is provided in which a non-magnetic substrate material is utilized to support a laminate formed of at least two layers of magnetic material having certain magnetic and optical properties optimized in one layer and certain switching properties optimized in another layer. The laminate layers are exchange-coupled at their interface to permit the propagation of a magnetic domain wall through the interface from the switching optimized layer to the optically optimized layer so that the direction of magnetization and Faraday rotation of the entire multi-layer magnetic material laminate can be reversed through application of an applied external magnetic field having a relatively small threshold value. A modified region of decreased anisotropy material is provided within the switching optimized layer to reduce the switching threshold field for the magneto-optic device to a fraction of the low threshold of the magnetic material of the switching optimized layer.

Abstract: A composite consisting of multiple layer structures, the basic structure of which is a chemically vapor deposited film on a substrate wafer is, disclosed herein. The film is of material which is appropriate for creating therein single wall magnetic domains which are capable of being moved about in predetermined directions within the thickness of the film and in the plane of the film. Devices are adapted to the film for sensing the motion of these domains, thereby enabling application of these structures to circuits which may be particularly utilized in memory or logic applications. A complete family of film on substrate materials is fabricated through a unique process. One of the steps of the process relates to the establishment within a reactor of the exact location of the substrate upon which deposition of the film is to be made. This is done in order to obtain desired film characteristics. Included are provisions for making multiple film layers as a matrix of films and hence a multitude of such circuits.