A magnetic memory recording component comprises a substrate adapted to support a magnetic memory storage medium coating. The substrate has at least a silicon carbide ceramic outer surface. If the silicon carbide ceramic outer surface has a depression in the surface thereof, the maximum depression of the maximum dimension as measured in any direction, e.g. width, depth, length or the like of the depression is less than 0.0001".

Magnetic recording component

An improved thin film magnetic memory device is fabricated by selective mechanical enhancement of the coercive force and anisotropic characteristics of the thin film magnetic material. The enhancement is produced by polishing the substrate with a fine abrasive in a direction parallel to the desired easy axis of magnetization prior to magnetic film deposition.

Mechanically enhanced magnetic memory

A substrate made of polycrystalline βSiC and having an essentially pore free surface is disclosed. The substrate is adapted for use as a chip wafer to receive different thin film coatings as part of manufacturing electrical devices and integrated circuits. The substrate comprises a polycrystalline silicon carbide outer surface with {111} crystallographic planes exposed on the working surface, the outer surface is essentially pore free or without exposed pores, scratches, steps or other such depressions or discontinuities on the surface of the substrate having at least one dimension larger than about 2.54 microns, and no non-stoichiometric silicon or carbon other than that which may be residual from the process of making silicon carbide ceramic material.

Polycrystalline silicon carbide ceramic wafer and substrate

Plated memory wire is provided with a nickel-phosphorous alloy protective coating through an electro-deposition process. The protective coating is electrically conductive, nonmagnetic and has a bright surface amenable to good solder bonding. The memory function is provided by a Saccharin-type nickel-iron-cobalt film and the protective overcoating is applied by submerging the wire in an electrolyte bath composed of 360 g/l of nickel sulfate (NiSO 4 .6H 2 O), 80 g/l of sodium sulfate (Na 2 SO 4 ), 60 g/l of sodium hypophosphite (NaH 2 PO 2 .H 2 O) and 25 g/l of boric acid (H 3 BO 3 ). The static bath is maintained at room temperature and the wire is moved through it at approximately eighteen inches per minute. An electro-deposition current density of from 20 to 80 ma./cm. 2 of plating area is employed.

Electro-deposition of a nonmagnetic conductive coating for memory wire protection

A magnetic memory recording component comprising at least a silicon carbide ceramic outer surface. If the silicon carbide ceramic outer surface has a depression in the surface thereof, the maximum depression of the maximum dimension as measured in any direction, e.g. width, depth, length or the like of the depression is less than 0.0001".

Magnetic recording device components

A PROCESS FOR DEPOSITING A NICKEL-COBALT MAGNETIC ELECTROPLATE UPON AN ELECTRICALLY CONDUCTING SUBSTRATE BY PASSING A CURRENT BETWEEN AN ANODE AND A SUBSTRATE AS THE CATHODE THROUGH AN ELECTROLYTE, WHERE THE ELECTROLYTE CONTAINS AT LEAST A SOLUBLE NICKEL SALT AND A SOLUBLE COBALT SALT IN SOLUTION, WITH THE IMPROVEMENT FOR THE PURPOSE OF EFFECTING THE MR/HC RATIO CHARACTERIZED BY THE ADDITION OF AT LEAST A SMALL BUT EFFECTIVE AMOUNT OF RHENIUM AS A SOLUBLE RHENIUM SALT TO THE ELECTROLYTE. THE RHENIUM MAY BE SPECIFICALLY ADDED AS POTASSIUM PERRHENATE TO AN ELECTROLYE COMPRISING NICKEL CHLORIDE AND COBALT CHLORIDE SALTS IN AN AQUEOUS SOLUTION.

Sidney L Phillips

Papers

Process for electroplating magnetic films for high density recording