Characterization of γ-Fe2O3 homogeneity in magnetic recording media by photoacoustics

Peralta, S. B.; Williams, A. W.
June 1989
Applied Physics Letters;6/12/1989, Vol. 54 Issue 24, p2405
Academic Journal
The degree of homogeneity of ferric oxide in magnetic tapes has been characterized using photoacoustic techniques. The method is based on excitation of the sample by a modulated laser beam and subsequent detection of its acoustic response via a condenser microphone. The acoustic response is dependent on the local thermal variations in the sample, and is a direct measurement of the distribution uniformity of the particulate metal oxide in the sample. Results of this study provide a potential means for the rapid evaluation of the quality of magnetic recording media.


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