THIN-FILM ELECTRO-MAGNETIC COIL DESIGN FOR USE IN A FLYING MAGNETO-OPTICAL HEAD

摘要

A thin-film micro coil (460U, 460L) is used in a flying magneto-optical head (106) includes a coiled conductor (861) that cooperates with a yoke (462) to permit an optimal magnetic flux density to be formed at a target point on the surface of, or within a storage medium. The yoke is formed of three sections: an upper section (863), an intermediate section (816) and a tip that defines an optical opening (823) and has its underside substantially flush with, or recessed relative to the underside of the undercoat layer for increasing the density of the magnetic field at a target distance from the coil. The yoke tip underside is defined by an inner edge that delineates the optical opening and that is formed of two semi-circular sections and two linear sections tangential to the semi-circular sections. The yoke can optically include an outer section that extends over the peripheral side of the insulation layer and that further extends in an enlarged toe section.