Abstract
Performance improvement for a magnetic read-out head using induced RF permeability change has been attempted from both electric and magnetic standpoints. First of all, from an electric viewpoint, the practical system noise reduction method capability for this new head was investigated. Results show that the system noise can be reduced accompanying an increase in reproducing sensitivity, by supplying an optimum forward bias voltage to a diode composing the peak-detector. Consequently, it has been confirmed that this method leads to a 6-10 dB improvement in the carrier-to-noise ratio for a read-out signal. From a magnetic standpoint, output voltage response to magnetic fields was investigated with magnetic film thickness as a parameter. Reproducing sensitivity was found to be suppressed by the eddy current and the demagnetizing field for an exciting RF magnetic field (Hrf), with increasing film thickness, if the domain behavior effect can be neglected. It is expected that the closed magnetic circuit for Hrf, as well as a signal field, will diminish this suppression.
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