Conformal high moment side shield seed layer for perpendicular magnetic recording writer
View Patent ↗A perpendicular magnetic recording writer for use in a data storage device, the recording transducer has a magnetic writer pole, a pole tip facing an air bearing surface (ABS). The pole tip has a pole face, leading side wall, a trailing side wall, a first side wall and a second side wall. A trailing side wall nonmagnetic gap layer on the trailing side wall, a first side wall nonmagnetic gap layer deposited on the first side wall, and a second side wall nonmagnetic gap layer deposited on the second side wall. A high magnetic moment seed layer is deposited on the trailing side wall nonmagnetic gap layer, the first side wall nonmagnetic gap layer, and the second side wall nonmagnetic gap layer. In other aspects of the invention shields are provided that have magnetic moments less than the magnetic moment of the seed layers.
1. A recording transducer for use in a data storage device, the recording transducer comprising a magnetic writer pole, the magnetic writer pole having a pole tip facing an air bearing surface (ABS);
the pole tip comprising a pole face, leading side wall, a trailing side wall, a first side wall and a second side wall;
the recording transducer further comprising:
a trailing side wall nonmagnetic gap layer deposited on the trailing side wall, a first side wall nonmagnetic gap layer deposited on the first side wall, and a second side wall nonmagnetic gap layer deposited on the second side wall, a first portion of the trailing side wall nonmagnetic gap layer being conformal with the trailing side wall and extending from the ABS;
a trailing seed layer comprising a first magnetic material, a first portion of the trailing seed layer extending from the ABS, deposited on a second portion of the trailing side wall nonmagnetic gap layer, being conformal with the trailing side wall nonmagnetic gap layer and being conformal with the trailing side wall, a second portion of the trailing seed layer being recessed from the ABS, adjacent to the first portion of the trailing seed layer, nonconformal with portion of the trailing sidewall nonmagnetic gap layer and nonconformal with the trailing side wall;
a first side seed layer comprising the first magnetic material deposited on the first side wall nonmagnetic gap layer, and
a second side seed layer comprising the first magnetic material deposited on the second side wall nonmagnetic gap layer;
wherein the first magnetic material has a magnetic moment (B s ) between 2.0 T and 2.4 T.
2. The recording transducer of claim 1 wherein the first side wall seed layer and second side wall seed layer each have a thickness of between 25 nm and 50 nm.
3. The recording transducer of claim 1 wherein the first magnetic material is deposited by physical vapor deposition (PVD) or ion beam deposition (IBD).