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The head efficiency of shielded current perpendicular to the plane (CPP) spin valve heads of 20 and 200 Gbpsi dimension has been computed and analyzed by an analytical approach utilizing the transmission line model (TLM), and a numerical approach using micro magnetic simulation. For the TLM, the effect of the circular current field was taken into account by incorporating the distribution of the effective permeability of the free layer. Both results showed higher head efficiency for the configuration where sense current field cancels the hard bias field at the front side (air-bearing side) of the free layer. The difference of efficiency by sense current direction was significant at higher sensor height and stronger hard bias. The effect was also observed experimentally on transfer curves from CPP spin valve heads of 20 Gbpsi dimension.

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SUMMARYWe simulated the phenomena of transit conduction in an insulating liquid with added ionic molecules such as surfactant, by using the charge-injection model with dissociation-recombination. When the parameters of C i (density of injected charge) and C 0 (density of created charge in the liquid) are C i > C 0 in this simulation, the waveform of current density showed an injection type with a peak, and when C i < C 0 , it showed a dissociation-recombination type. A decreasing characteristic appeared in the low electric field, maximum one in the middle field, and saturating one in the high field.