Patent ID: 8920947

Claim:
A microwave assisted magnetic recording (MAMR) structure, comprising: (a) a composite seed layer formed on a substrate and having a Ta/M1/M2 configuration where M1 is a metal or alloy having a fcc(111) or (hcp) hexagonal closed packed (001) crystal orientation, and M2 is a metal unequal to M1, said composite seed layer forms an interface with an overlying spin injection layer; (b) the spin injection layer (SIL) comprised of a laminated structure with perpendicular magnetic anisotropy (PMA) represented by (CoFe/Ni) X , (CoFeR/Ni) X , (Co/NiFe) X , (Co/NiCo) X , (CoFe/NiFe) X , or (CoFe/NiCo) X where x is between 5 and 50 and R is Ru, Rh, Pd, Ti, Zr, Hf, Ni, Cr, Mg, Mn, or Cu, a CoFe, CoFeR, or Co layer has a lesser thickness than a Ni, NiFe, or NiCo layer, and an interface is formed between each pair of adjoining layers in the laminated structure; and (c) an oxygen surfactant layer consisting of oxygen formed at the interface between the composite seed layer and SIL, and/or at one or more interfaces in the SIL.