effecting microsecond rate magnetic recording and information transfer onto a magnetochemical surface the bias field is established using a suitably shaped permanent magnet material and conducting the magnetic field directly to the recording area upon a point to point basis through a sheaf of magnetic field conducting wires the sheaf is surrounded by an external coil of electrical wire capable with current flow of modulating the magnet established bias field transmitted through the sheaf of wires to the base of a printed circuit board carrying the x y distribution of tiny solenoids each centered with a pre oriented magnetic metal core and each core placed in contact with one of the bias magnetic field carrying wires of the sheaf the combination operable with electronic information interfacing through high speed low current pulses inducing magnetic fields that add to the bias field and effect point to point magnetic field recording upon a magnetochemical surface placed against the surface of the solenoid application_number US 63552984 A description referring more specifically to the drawings there is shown in fig1 a plane surface coil of a conductor 1 prepared by printed circuit techniques and capable of accepting current flow from either of the x y inputs 2 and 3 to generate a magnetic field having maximum strength at the center of the coil and a field direction perpendicular to the.