Randomized Telegraphic Noise in Advanced GMR Spin-Valve Recording Heads

概要

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Modern GMR reader sensors exhibit magnetic instabilities phenomena. Signatures from read back signals and amplitude spikes can cause sudden magnetic signal fluctuation. In this paper, we studied bottom spin valve heads capable of storing from 40 Gigabyte or more of data on a single 95 mm platter. A systematic study was conducted to investigate different types of instabilities as they affect magnetic signal amplitudes and asymmetries. We have the discriminating power to confirm if the instability was externally induced, or intrinsic to the GMR sensor. By switching, write current on and off and sandwiching it between turning bias voltage on and off we were able to understand the mechanism of each mode. A simplistic but well understood(COR)technique was developed to correctly identify the causing mechanism.
社団法人電子情報通信学会の論文
2001-11-01