8 ITMP3 / 8éme conférence internationale de photoacoustique et photothermique
J. Phys. IV France 04 (1994) C7-3-C7-6
Photothermally modulated playback from a magnetic tapeJ. Pelzl1, M. Kaack1, Th. Orth1 and K. Friedrich2
1 Institut für Experimentalphysik III, Festkörperspektroskopie, Ruhr-Universität, 44780 Bochum, Germany
2 On leave from the Friedrich-Schiller-Universität Jena
A novel method is presented which allows spatially resolved detection of magnetic signals from tapes. The PM-playback signal is generated in the head of a tape recorder by thermal modulation of the magnetization of the stationary tape. The PM-playback has been observed from homogeneously magnetized Fe2O3, CrO2 and ferrochrome tapes and from a sinusoidal track recorded on a CrO2 tape. From the signals measured as a function of laser spot position and of modulation frequency the depth and lateral variation of the magnetisation has been determined.
© EDP Sciences 1994