Title :
GMR multilayers and head design for ultrahigh density magnetic recording
Author :
Smith, Neil ; Zeltser, Alexander M. ; Parker, Martin R.
Author_Institution :
Eastman Kodak Co., San Diego, CA, USA
fDate :
1/1/1996 12:00:00 AM
Abstract :
This paper describes materials development, device modeling, and initial test results for a novel GMR reproduce head for ultrahigh density recoding (~ 10 Gbit/in2). It consists simply of a 20-bilayer GMR multilayer, self-stabilized by intrinsic antiferromagnetic interlayer coupling, and self-biased by sense current into a bipolar, field-gradient-sensing bias state. Analogous to a dual magnetoresistive (DMR) such a GMR-DMR head is capable of achieving very high linear resolution without shields. Tape-test results using evaporated NiFe/Cu and sputtered NiFeCo/Cu agree reasonably well with theoretical expectations. 1/f noise in these GMR multilayers will also be discussed
Keywords :
1/f noise; giant magnetoresistance; magnetic heads; magnetic multilayers; magnetic recording noise; magnetoresistive devices; 1/f noise; GMR multilayers; GMR-DMR head; NiFe-Cu; NiFeCo-Cu; antiferromagnetic interlayer coupling; bipolar field-gradient-sensing; device modeling; dual magnetoresistance; evaporated NiFe/Cu; giant magnetoresistance; linear resolution; self-biasing; self-stabilization; sputtered NiFeCo/Cu; tape test; ultrahigh density magnetic recording; Anisotropic magnetoresistance; Antiferromagnetic materials; Giant magnetoresistance; Magnetic anisotropy; Magnetic heads; Magnetic multilayers; Magnetic recording; Magnetic shielding; Magnetostatics; Perpendicular magnetic anisotropy;
Journal_Title :
Magnetics, IEEE Transactions on
