Patent ID: 8305711

Claim:
A microwave assisted magnetic recording (MAMR) writer structure having a spin transfer oscillator (STO) self aligned to an adjoining octagonal shaped portion of a write pole along an air bearing surface (ABS), comprising: (a) an octagonal write pole formed on a substrate, comprising: (1) a lower portion including a leading edge of the octagonal write pole and two lower sections of write pole sidewalls formed at a first angle with respect to a plane that is perpendicular to the substrate and to the ABS such that the width of the leading edge is less than the distance between two ends of the two lower sections that are a first distance from the substrate in a down track direction; (2) a middle portion including two middle sections of write pole sidewalls each having a first end connected to an end of an upper sidewall section at a first corner, and a second end connected to an end of a lower sidewall section at a second corner, said middle sections of sidewalls each form a second angle with respect to a plane that is perpendicular to the substrate and to the ABS and a distance between second corners along a second plane parallel to the substrate is greater than a distance between first corners along a first plane parallel to the substrate; and (3) a top portion including a trailing edge of the octagonal write pole and two upper sidewall sections that extend in a down track direction from two ends of the trailing edge such that an end of each upper sidewall section opposite the trailing edge connects with an end of a middle sidewall section at a first corner; and (b) a STO with a lower surface that contacts the trailing edge of the octagonal write pole, a top surface, and two sidewalls that connect the top surface with the lower surface and are formed coplanar with the upper sidewall sections of the top portion of the octagonal write pole, said STO is comprised of a spin injection layer (SIL), non-magnetic spacer, and field generation layer (FGL) that are sequentially formed on the trailing edge.