Accession Number : AD0290805

Title :   HEXAGONAL MAGNETIC COMPOUNDS

Corporate Author : DAVID SARNOFF RESEARCH CENTER PRINCETON N J

Personal Author(s) : HARVEY,ROBERT L. ; GORDON,IRWIN ; BRADEN,R.A.

Report Date : 14 SEP 1962

Pagination or Media Count : 1

Abstract : Variation in the processing steps of the compound (Ni.3 Cu.7 Zn1.0)Y resulted in no appreciable change in the density or saturation magnetization over the experimental range. The microwave line width is appreciably dependent on the final firing temperature. At low temperatures the improvement in orientation induced by crystallite growth during the firing was insufficient. At very high firing temperatures increase in line width is thought to be due to a small chemical change. A critical amount of Zn, Ni, or Cu in (Co2)W substantially improved the high frequency properties. Replacing some Fe2O3 with Al2O3 in the compound (Co2)W resulted in inferior high frequency properties. Certain oxides added to (Co2)Z definitely improved the inherently poor permeability-temperature property. The addition of the proper amount of MnO or As2O3 to (Co2)Z resulted in a sample having a stable value of permeability over a considerable range of ambient temperature. The use of a small amount of MnO or PbO as the additive did not materially impair the high frequency properties. The addition of any of the fourteen additives to (Co2)Z increased the microwave line width. (Author)

Descriptors :   *FERROMAGNETIC MATERIALS, *MAGNETIC MATERIALS, *PARAMAGNETIC MATERIALS, ADDITIVES, ARSENIC COMPOUNDS, COBALT ALLOYS, COPPER ALLOYS, FREQUENCY, HEAT TREATMENT, HIGH FREQUENCY, MAGNETIC PROPERTIES, MAGNETIC TAPE, MANGANESE COMPOUNDS, MANUFACTURING, METAL CRYSTALS, MICROWAVE SPECTROSCOPY, NICKEL ALLOYS, OXIDES, ZINC ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE