Recording and Reproducing Efficiency of Main-Pole Driven Perpendicular Magnetic Head

The reproducing efficiency of a perpendicular magnetic recording head was investigated. Miniaturization and adoption of a head construction with a closed magnetic circuit and coil wound close to the main pole are very effective ways to improve the readout efficiency. We have designed and fabricated a main pole-driven perpendicular head with a thin film coil wound around the main pole film in addition to the wire coil. The readout voltage per turn of the thin film coil was confirmed to be double that of the wire coil, and the same readout voltage as from a thin film perpendicular head with a double-sided return path core can be obtained when the two coils of this head are used in series.