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

fYear

2005

fDate

4-8 April 2005

Firstpage

1705

Lastpage

1706

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Magnetics Conference, 2005. INTERMAG Asia 2005. Digests of the IEEE International

Print_ISBN

0-7803-9009-1

Type

conf

DOI

10.1109/INTMAG.2005.1464286

Filename

1464286