- Conference date: 13–16 November 1973
- Location: Boston, Massachusetts
We have previously described our work on Cobaloy tape particles.1 We have now improved the properties of these particles (composition: 18% Fe, 18% Ni, 64% Co) so that they have superior physical and magnetic properties. They are highly oxidation resistant, have a coercive force which has little temperature dependence (25% increase from room temperature to liquid nitrogen), high magnetic moment ( ), and morphology controllable by the manufacturing process. The particle size range can also be controlled, resulting in a narrow switching field range of about 2:1. The particle size ranges from about O.lμ to 0.5μ. Particle shape is . B/H meter curves show squarenesses greater than 0.8. Impurity additions of Ce, Ti, and Ca control Hc from 100 oe. to 1200 oe. We will give extensive data on temperature dependence, stability and magnetic parameters. The ability to closely control size, shape and Hc makes these particles of interest for use in ferrofluids, for Bitter patterns, magnetographic printing and magnetic tapes.
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