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GMR HEAD FREE LAYER BIAS CONTROL BY CANTED PINNED MAGNETIZATION

IP.com Disclosure Number: IPCOM000013505D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2003-Jun-18
Document File: 1 page(s) / 26K

Publishing Venue

IBM

Abstract

Read signal asymmetry is determined by the angle between the magnetizations of the Free and the Pinned layers. This angle should be near 90 degree to achieve near zero read signal asymmetry. For AP-pinned GMR sensors, the Free layer magnetization makes an angle less than 90 degree with the Pinned layer magnetization. The canting of the Free layer magnetization is caused by the field acting on it. This field is produced by the current flowing in the layers other than the Free layer. This leads to large signal asymmetry, i.e., positive signal becomes very different in value as compared to the negative signal. It is possible to bring the signal asymmetry near zero by canting the Pinned magnetization so that angle between them approches 90 degree. 1

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GMR HEAD FREE LAYER BIAS CONTROL BY CANTED PINNED MAGNETIZATION

   Read signal asymmetry is determined by the angle between the magnetizations of
the Free and the Pinned layers. This angle should be near 90 degree to achieve
near zero read signal asymmetry. For AP-pinned GMR sensors, the Free layer
magnetization makes an angle less than 90 degree with the Pinned layer
magnetization. The canting of the Free layer magnetization is caused by the field
acting on it. This field is produced by the current flowing in the layers other
than the Free layer. This leads to large signal asymmetry, i.e., positive signal
becomes very different in value as compared to the negative signal. It is
possible to bring the signal asymmetry near zero by canting the Pinned
magnetization so that angle between them approches 90 degree.

1