Patent ID: 8031426

Claim:
A thin-film magnetic head having microwave magnetic exciting function, comprising: a write magnetic field production means for producing, in response to a write signal, a write magnetic field to be applied into a magnetic recording medium; a line conductor of a microwave radiator of a plane-structure type, formed independent from said write magnetic field production means, for radiating, by feeding there through a microwave excitation current, a microwave band resonance magnetic field with a frequency equal to or in a range substantially at a ferromagnetic resonance frequency F R of said magnetic recording medium; and two conductors separated from said line conductor in a direction perpendicular to a track-width direction of said thin-film magnetic head and parallel to an air bearing surface of said thin-film magnetic head, said microwave radiator being an inverted micro strip waveguide having said line conductor and a ground conductor constituted by said magnetic recording medium, a section of said line conductor, perpendicular to the track-width direction, having a rectangular shape, an aspect ratio B/A being within a region from 0.15 to 1.2 or within a region of 7 or more, where A is a length in a lateral direction of said line conductor, which is in parallel with the air bearing surface and perpendicular to the track-width direction, and B is a length in a longitudinal direction of said line conductor, which is perpendicular to the air bearing surface.