Characterization of γ-Fe2O3 homogeneity in magnetic recording media by photoacoustics
- 12 June 1989
- journal article
- conference paper
- Published by AIP Publishing in Applied Physics Letters
- Vol. 54 (24) , 2405-2407
- https://doi.org/10.1063/1.101534
Abstract
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.Keywords
This publication has 15 references indexed in Scilit:
- Photoacoustic microscopy of layered samples: phase-detection techniqueJournal of Physics D: Applied Physics, 1985
- Photoacoustic measurement of thermal properties of a thin polyester filmApplied Physics Letters, 1984
- Ferromagnetic resonance depth profiles of magnetic tapes using frequency-dependent photoacoustic detectionApplied Physics Letters, 1984
- Thin-film thickness measurements with thermal wavesApplied Physics Letters, 1983
- Photoacoustic determination of thin-film thermal propertiesApplied Physics Letters, 1983
- Thermal-wave depth profiling: TheoryJournal of Applied Physics, 1982
- Thermal wave microscopy with photoacousticsJournal of Applied Physics, 1980
- Photoacoustic microscopeElectronics Letters, 1979
- Analytical optoacoustic spectrometry. Part III. The optoacoustic effect and thermal diffusivityThe Analyst, 1977
- Theory of the photoacoustic effect with solidsJournal of Applied Physics, 1976