Abstract
Two series of tapes were coated to investigate the effect of switching field distribution (SFD) and intrinsic coercivity (H ci ) on audio recording properties. In the first series the concentration of γ-Fe 2 O 3 was varied by dilution with α-Fe 2 O 3 . The SFD, which increased with the amount of α-Fe 2 O 3 present, had a large effect on the linear recording range. Signal loss associated with SFD was separated from demagnetization loss. In the second series γ-Fe 2 O 3 was blended with different amounts of cobalt doped γ-Fe 2 O 3 in order to vary H ci . The ratio of short wavelength saturated output to sensitivity expressed in volts was proportional to H ci .
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