A study of the effect of remanence and thickness on the recording properties of thick particulate media

The digital recording performance of a wide variety of particulate media is related to their magnetic properties. The results are compared with the somewhat divergent relationships proposed empirically and theoretically for thin metal films. It is shown that neither the empirical nor the theoretical laws consistently explain the behavior of particular media over the range of materials and compositions explored. The main points are the following. 1) For relatively low values of magnetization and relatively large thicknesses, the relationships tend to be linear more in agreement with theory. Also, the resolution is dependent upon the remanent intensity of magnetization, again in agreement with theory. 2) For relatively thin tapes having a high magnetization, the observed relationships are approximately in agreement with those found empirically for thin films.