Abstract: Flux sensitive apparatus, in one form thereof, employs paired thin single domain magnetic film structures, the easy magnetization axes of which are canted with respect to the direction of sense current flow therewithin. The magnetization vectors of the film structures are opposite with respect to each other, thereby to preclude, or at least lessen, demagnetization fields associated with the structures. By special connections between the thin film structures, the respective sense currents therein are provided with the same spatial direction of flow; and mutual biasing of the structures is thereby avoided.

Abstract: A magnetic recording which is useful as a mirror image duplication video tape master is made from another magnetic recording by anhysteretic transfer at a temperature at which the coercive force of the master is much less than the coercive force of the other recording. Preferably, the magnetic recording layer of the master comprises fine particles of a manganese bismuth alloy, the coercivity of which decreases with decreasing temperature, and the other record comprises a magnetic recording layer having a coercivity which increases with decreasing temperature. The master record may subsequently be used to duplicate copies of the recording by anhysteretic transfer to a copy record having a coercive force which, at the temperature at which the transfer is made (typically room temperature), is substantially lower than the coercive force of the master.

Abstract: A flux sensitive magnetic head is disclosed wherein a thin single domain magnetic film coated on a non-conductor bridges the head gap. A magnetic bias is applied to the hard axis of the film; and flux entering the gap causes the resistivity of the film to vary about a resistance reference established by the bias. The resistance variation is converted to a useful signal corresponding to the flux entering the gap.

Abstract: The source of anomalies in the performance characteristics of a magnetic head employing a sense wire having a thin film coated thereon and a coil coupled therewith is explained. Solution to the problem anomalies centers around use of a mandril for the coil.

Abstract: Method and apparatus are provided for forming a magnetic image on a recording element replicating incident image illumination. The recording element is a composite structure comprising a photoconductive, piezoelectric component and a magnetostrictive component. By rigidly associating these components, mechanical stress generated by the illumination of the photoconductive, piezoelectric component is transmitted to the magnetostrictive component, in which the mechanical stress is converted to imagewise coercivity variations. If the recording element is simultaneously subjected to a magnetic field, a remanent magnetic field that replicates the image is produced in the magnetostrictive component.

Abstract: Magnetic image recording methods and apparatus employ a magnetic recording medium susceptible to an image-wise change of magnetization in response to thermal image patterns provided by image-wise exposures of a thermal image pattern generating device. The thermal device is subjected to repeated image-wise exposures, with each exposure including an exposure to an image part to which the thermal device is also exposed during another one of the exposures. The thermal device is moved relative to the recording medium between exposures, and the image is magnetically recorded onto the recording medium with the aid of thermal image patterns generated by the exposures.In accordance with another aspect, the mentioned thermal device is exposed at different spatial locations to each elemental area of the image.

Abstract: A method and device for measuring strain in which the resistance of a layer of piezoelectric semiconductor material is measured across a dimension along which the resistance is strain sensitive by a gauge factor of at least 100.