Patent ID: 8582240
Filing Date: 2013-11-12
Classification: G11B

Abstract:
1. A microwave assisted magnetic recording (MAMR) structure that includes a write head, comprising: (a) a main pole that generates a magnetic flux field which is directed through a pole tip at an air bearing surface (ABS) and into a magnetic medium comprised of a plurality of bits, the magnetic flux has a gap field component that is directed across a spin torque oscillator (STO) and into a write shield; (b) the write shield with a side along the ABS that collects magnetic flux which has passed through the magnetic medium and written one or more bits; (c) the STO that is formed along the ABS and generates a rf field on the magnetic medium and thereby assists the writing to one or more bits; and (d) a bias tee (T) that is electrically connected by a lead to the main pole and by a lead to the write shield, and combines dc from a dc source and rf current from a rf current source and injects the dc and rf current combination into the STO to provide a dc bias, and a rf bias to the STO.