Magnetic head having a pair of magneto-resistive (MR) readers of the same type with each reader being tuned differently

A magnetic head comprising:

• a first anisotropic magneto-resistive (AMR) reader;
• a second AMR reader;
• wherein both of the AMR readers are of the same type and are tuned to sense magnetic flux differently with respect to one another such that the first AMR reader is capable of sensing magnetic flux from one type of magnetic media and the second AMR reader is capable of sensing magnetic flux from another type of magnetic media whereby the magnetic head is capable of reading two different types of magnetic media;
• wherein the first AMR reader includes an AMR sensor sandwiched between an AMR sensor bottom shield and a shared shield, wherein the shared shield serves as an AMR sensor top shield for the AMR sensor of the first AMR reader;
• and
• a writer, wherein the writer includes a write gap layer on the shared shield and includes a top pole on the write gap layer, wherein the shared shield serves as a bottom pole for the writer;
• wherein the second AMR reader includes an AMR sensor sandwiched between an AMR sensor bottom shield and an AMR sensor top shield, wherein an insulating gap layer separates the AMR sensor bottom shield of the second AMR reader from the top pole of the writer.

A magnetic head comprising:

• a first giant magneto-resistive (GMR) reader;
• a second GMR reader;
• wherein both of the GMR readers are of the same type and are tuned to sense magnetic flux differently with respect to one another such that the first GMR reader is capable of sensing magnetic flux from one type of magnetic media and the second GMR reader is capable of sensing magnetic flux from another type of magnetic media whereby the magnetic head is capable of reading two different types of magnetic media;
• wherein the first GMR reader includes a GMR sensor sandwiched between a GMR sensor bottom shield and a shared shield, wherein the shared shield serves as a GMR sensor top shield for the GMR sensor of the first GMR reader;
• and
• a writer, wherein the writer includes a write gap layer on the shared shield and includes a top pole on the write gap layer, wherein the shared shield serves as a bottom pole for the writer;
• wherein the second GMR reader includes a GMR sensor sandwiched between a GMR sensor bottom shield and a GMR sensor top shield, wherein an insulating gap layer separates the GMR sensor bottom shield of the second GMR reader from the top pole of the writer.