Thin Film Media With a Tilted Easy Magnetisation Direction

Co-Cr layers and metal evaporated tape with a tilted easy magnetisation direction have been investigated. In these media the recording direction with respect to the easy magnetisation direction is important. This is investigated with the help of recording experiments and recording simulation experiments. For the investigated media the same two phenomena affect the recording performance: the occurrence of interference minima in the frequency response and the steepness of the transitions. The optimum recording direction depends on which phenomenon dominates. For media with a more perpendicular easy magnetisation direction the occurrence of the minima is most important, while for the more longitudinal media the steepness of the transitions is most important. Therefore, the optimum recording direction is opposite for the two types of media.