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The growth mechanism that determines the microstructure of obliquely evaporated Co-CoO tapes has been investigated. A preferred orientation relation hcp-Co 001 CoO 111 is found in the neighboring grains when the hcp-Co grains grow on top of the CoO. However, no preferred orientation is observed in the lower to middle part of the magnetic layer when the CoO grains grow on top of the hcp-Co. The structural properties of the Co-CoO tapes can be explained accordingly based on the preferred orientation relation.

Electrode biasing experiments were carried out in various magnetic configurations on the Large Helical Device (LHD). The transitions of poloidal viscosity, which were accompanied with bifurcation phenomena characterized by a negative resistance in an electrode characteristic, were clearly observed on LHD by the electrode biasing. The critical external driving force required for transition was compared with the local maximum in ion viscosity, and the radial resistivity before the transition also compared with the expected value from a neoclassical theory. The critical driving force increased and the radial resistivity decreased with the major radius of the magnetic axis Rax going outwards. The configuration dependence of the transition condition and the radial resistivity qualitatively agreed with neoclassical theories. The radial electric field and the viscosity were also evaluated by the neoclassical transport code for a non-axisymmetric system, and estimated electrode voltage required for the transition, which was consistent with the experimental results.

First column, lines 9 and 10: '. ..[MovO(ttp)X] (X = monoanionic ligand) gives [MovO(ttp)(02)]-9 . . . ' should read '. ..[MovO(tpp)X] (X = monoanionic ligand) gives [MoVO(tpp)(02)]-9...' Fourth column, line 3 from the bottom: '...[MoVIO(tmp)]...' should read '...[MoIVO(tmp)]...'.

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Co-Cr/Ni-Fe double layer hard disk medium for a new contact SPT head system was investigated in regard to its design. The medium was prepared with an RF sputtering system, sequentially depositing a Cr or a Ti underlayer, a soft-magnetic backlayer, a Co-Cr recording layer and a Si0 2 protective layer. The Cr underlayer with thickness of 0.025 f11n realized the most excellent crystallinity of the backlayer. The largest signal-to-noise ratio of 35 dB was obtained with thickness of 0.5 to 1.0 f11n for the Cu-Mo-Permalloy backlayer, and with about 2.0 f11n thickness for the Nb-Permalloy one, respectively. Addition of Ta to a Co-Cr system was also examined to narrow the anisotropy field distribution. It was found that a high output at high recording densities could be obtained for the narrowed ani.'IOtropy field distribution.

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