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One of the most intriguing problems in understanding the recording behavior of thin metallic surfaces is to determine the extent to which this behavior depends on and correlates with the magnetic properties of the surface. From the point of view of demagnetization it is obvious that the recording surface with the best high density resolution is one that has zero moment; unfortunately, this surface also has zero signal. It is apparent from this limiting case that there exists at any given composition-subject to a minimum acceptable signal-to-noise ratio-an optimum moment for any particular recording density. Furthermore, the coercivity and the steepness of the sides of the hysteresis loop are also implicated in determining the ability of the surface to resist demagnetization and to match the writing transducer field gradient.