NDLI: CPP-GMR reader and wraparound shield writer for perpendicular recording

Content Provider	IEEE Xplore Digital Library
Author	Nakamoto, K. Hoshiya, H. Katada, H. Okada, T. Hatatani, M. Hoshino, K. Yoshida, N. Nunokawa, I. Etoh, K. Watanabe, K.
Copyright Year	1965
Abstract	Current-perpendicular-to-plane (CPP) giant magnetoresistive (GMR) read heads and wraparound shielded write heads for perpendicular recording were fabricated, and their recording performance was tested. The measured readout waveform of the CPP-GMR head was noise free and well biased. An output voltage of 2.2 mV and head-amp signal-to-noise ratio (SNR) of 30 dB were obtained from an operating voltage of 120 mV. Thermal damage in the heads was caused by an increase in the area of pinholes. The activation energy for the 5% resistance reduction was estimated to be 2.3 eV, which was similar to the self-diffusion energy of Co. The lifetime of the heads was projected to be 200 years. Newly developed CPP-GMR films showed the MR ratio of 6% at the resistance area product of 0.3 /spl Omega//spl mu/m/sup 2/. The wraparound shielded write heads showed similar overwrite values to that of the unshielded heads. The shielded heads showed about 1 dB better media SNR and 5%-10% better linear resolution than the unshielded heads. Smaller side writing was found in the wraparound shield design, when the half-width of the off-track profile was the same. Better down-track and cross-track performance was thought to be due to a tighter field distribution in the shielded heads.
Sponsorship	IEEE Magnetics Society
Starting Page	2914
Ending Page	2919
Page Count	6
File Size	862815
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	Perpendicular magnetic recording Magnetic heads Giant magnetoresistance Voltage Signal to noise ratio Testing Noise measurement Life estimation Lifetime estimation Writing wraparound shield Activation energy current-perpendicular-to-plane (CPP)-giant magnetoresistive (GMR) perpendicular recording reliability
Content Type	Text
Resource Type	Article
Subject	Electronic, Optical and Magnetic Materials Electrical and Electronic Engineering

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CPP-GMR reader and wraparound shield writer for perpendicular recording

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