NDLI: Sensing-current dependence of peak asymmetry in CPP-GMR heads

Content Provider	IEEE Xplore Digital Library
Author	Katada, H. Hoshino, K. Yoshida, N. Suzuki, K. Watanabe, K. Hoshiya, H. Nakamoto, K.
Copyright Year	1965
Abstract	The read performance, especially peak asymmetry, of current-perpendicular-to-the-plane giant-magnetoresistive (CPP-GMR) heads with a current screen layer (nano oxide layer having a confined current path) was investigated through a spin stand test and a micromagnetic simulation. We fabricated CPP-GMR heads having a magnetoresistive (MR) ratio of 3%. The head-amplifier signal-to-noise ratio of the CPP-GMR heads with longitudinal media was 18-27 dB with a bandwidth of 200 MHz. The peak asymmetry of these heads has a complicated dependence on the sensing current. This complicated behavior can be explained in terms of the particular transfer curve for the CPP-GMR head. The transfer curve calculated from the micromagnetic simulation was "stair-like," having kinks caused by the current-induced field. Increasing the sensing current changes the positions of the kinks on the transfer curve. This stair-like transfer curve directly influences the peak asymmetry through the sensing current. Accordingly, the longitudinal bias field, sensor size, and current-induced biasing should be considered when controlling the peak asymmetry of the CPP-GMR heads.
Sponsorship	IEEE Magnetics Society
Starting Page	2947
Ending Page	2949
Page Count	3
File Size	266061
File Format	PDF
ISSN	00189464
Volume Number	41
Issue Number	10
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Magnetic heads Micromagnetics Signal to noise ratio Testing Magnetoresistance Bandwidth Magnetic sensors Electrical resistance measurement Magnetic confinement Size control SNR CPP-GMR current induced field nano oxide layer peak asymmetry read performance
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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Spin-Torque Noise in CPP-GMR Heads With Current Screen Layer

Simulation of noise, signal-to-noise and bandwidth of TMR and CIP/CPP GMR heads

Effect of Current-Confined Path on Spin-Torque Noise in CPP-GMR Heads With Current Screen Layer

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Sensing-current dependence of peak asymmetry in CPP-GMR heads

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