Abstract
Acoustic emission and friction coefficients have been measured during start-stop and continuous sliding for pure and doped barium ferrite films, without lubrication, and compared with concomitant surface topography and magnetic properties. Barium ferrite films averaging about 100 nm in thickness, were produced on thermally oxidized Si substrates by sputter deposition and then furnace or rapid thermal annealed in order to develop optimum microstructure and magnetic characteristics. Four varieties of (hexagonal) barium ferrite were produced and investigated: pure barium ferrite with longitudinal and perpendicular c-axis orientation, pure barium ferrite with perpendicular orientation with Pt underlayer and doped barium ferrite. Results are compared with data obtained from commercial disks with a carbon overcoat.
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