Patent ID: 8817426
Filing Date: 2014-08-26
Classification: G01R,G11B,Y10T

Abstract:
1. A magnetic read sensor, comprising: a magnetic pinned layer structure including a first magnetic layer structure, a second magnetic layer structure and a non-magnetic coupling layer sandwiched between the first and second magnetic layer structures; a magnetic free layer structure; and a non-magnetic barrier layer sandwiched between the magnetic free layer structure and the magnetic pinned layer structure; wherein the second magnetic layer structure of the pinned layer structure comprises first, second, third and fourth magnetic sub-layers, the first magnetic sub-layer consisting of Co and being located adjacent to the non-magnetic coupling layer, the second magnetic sub-layer comprising CoFeBTa and contacting the first magnetic sub-layer, the third magnetic sub-layer comprising CoFeB and contacting the second magnetic sub-layer and the fourth magnetic sub-layer contacting the third magnetic sub-layer and comprising CoFe.