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Conditions for producing Fe-Ni-Co alloy films on polyester tape by evaporation were studied as to their suitability as magnetic tape storage films. Evaporated films were tested for mechanical and chemical properties as well as magnetic and storage behavior. For achievable storage density the ratio of coercive field strength to saturation remanence is of essential importance. Alloys having high stress anisotropy show the most favorable ratio. Such alloys with a suitable selected film thickness enable a pulse storage of high density. Measures were also tested to obtain highly coercive evaporated films.