Title :
Sensing current dependence of peak symmetry in CPP-GMR heads
Author :
Katada, H. ; Hoshino, Kenji ; Yoshida, N. ; Suzuki, Kenji ; Watanabe, K. ; Hoshiya, H. ; Nakamoto, K.
Author_Institution :
Storage Technol. Res. Center, Hitachi Ltd., Kanagawa, Japan
Abstract :
In this paper, current-perpendicular-to-plane-giant magnetoresistance (CPP-GMR) heads are fabricated and their read performance is analyzed. The peak asymmetry through dynamic electrical tests (DET) and micromagnetic simulations are studied. The heads have a MR ratio of 3%, physical track width of 80 nm and shield-to-shield gap of 60 nm. Results from micromagnetic simulations show that the peak asymmetry strongly depends on the sensing current. This dependence of the peak asymmetry can be understood by using a simple model that shows the stimulated magnetization state of the free layer with a sensing current of +2.5 mA.
Keywords :
giant magnetoresistance; magnetic heads; magnetisation; magnetoresistive devices; micromagnetics; 2.5 mA; 60 nm; 80 nm; MR ratio; current-perpendicular-to-plane-giant-magnetoresistance heads; dynamic electrical tests; micromagnetic simulations; peak asymmetry; physical track width; read performance; sensing current; shield gap; stimulated magnetization state; Gaussian processes; Magnetic fields; Magnetic heads; Magnetic recording; Magnetization; Micromagnetics; Performance analysis; Performance evaluation; Permanent magnets; Testing;
Conference_Titel :
Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International
Print_ISBN :
0-7803-9009-1
DOI :
10.1109/INTMAG.2005.1464286
