A new concept of MR gradiometer heads

Zhi Gang Wang, Na Helian, Desmond J Mapps, David Wilton

Research output: Contribution to conferencePaperpeer-review


he Magnetoresistive gradiometer (MRG) head, which differences the electrical signals obtained from two parallel. magnetoresistive elements separated by a thin, non-ferromagnetic. non-conductive film. has an advantage to reduce common mode noise while maintaining sensitivity to magnetic field gradients.'.'In this work, we first present a new concept of servoing with MRG heads. Due to the intrinsic asymmetry of the 45" bias in the single domain MR film, the output voltage can not reach its maximum value even as the transverse displacement of the head from the recorded track is zero. We actively make use of the asymmetry phenomenon to determine the offtrack perturbation X,. The sum of the elements' output envelope, demodulated by a peak value detection circuit, will be considered as position error signal (PES) for servo purpose. Within 30% of the track width. PES is proportional to the misregistration X, and …
Original languageEnglish
Publication statusPublished - 6 Jan 1998
Event1998 IEEE International Magnetics Conference - San Francisco, United States
Duration: 6 Jan 19989 Jan 1998


Conference1998 IEEE International Magnetics Conference
Abbreviated titleINTERMAG
Country/TerritoryUnited States
CitySan Francisco
Internet address


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