THE PREPARATION AND CHARACTERISTICS OF THIN FERROMAGNETIC FILMS
REMINGTON RAND UNIVAC PHILADELPHIA PA
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This report describes the results of an experimental study of the magnetic properties of thin films prepared by chemical methods. Electrodeposition in aqueous solutions and thermal decomposition of carbonyl vapors have shown very encouraging results. Electrodeposited ferromagnetic nickel-iron films having thicknesses in the range 2500 to 3000A give reproducible results when a glass substrate is used onto which a conductive layer of gold sputtered. Film deposited on Mylar having a conductive layer of evaporated chronium and copper also give good magnetic properties. Such films exhibit an average coercive force of about 1.2 oersteds and Hk on 3 to 5 oersteds depending on their composition. Switching constants of 0.05 to 0.20 oersted-microsecond are obtained by application of crossfields of about 0.25 Hk. Films produced by thermal decomposition of carbonyl mixtures do not as yet show comparable magnetic or switching properties. Control of this process Is quite difficult, but fairly reproducible results can be obtained by depositing the films on glass substrates and nbsequently annealing then in a hydrogen atmosphere. The average alues of coercive force obtained after annealing for films of about 3000 are 2.5 oersteds.
- Ceramics, Refractories and Glass
- Electricity and Magnetism