A new concept of MR gradiometer heads

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

doi:10.1109/INTMAG.1998.742073

A new concept of MR gradiometer heads

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

Research output: Contribution to conference › Paper › peer-review

Abstract

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 language	English
Pages	177-177
DOIs	https://doi.org/10.1109/INTMAG.1998.742073
Publication status	Published - 6 Jan 1998
Event	1998 IEEE International Magnetics Conference - San Francisco, United States Duration: 6 Jan 1998 → 9 Jan 1998 https://ieeexplore.ieee.org/xpl/conhome/5941/proceeding

Conference

Conference	1998 IEEE International Magnetics Conference
Abbreviated title	INTERMAG
Country/Territory	United States
City	San Francisco
Period	6/01/98 → 9/01/98
Internet address	https://ieeexplore.ieee.org/xpl/conhome/5941/proceeding

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10.1109/INTMAG.1998.742073

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title = "A new concept of MR gradiometer heads",

abstract = "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 …",

author = "Wang, {Zhi Gang} and Na Helian and Mapps, {Desmond J} and David Wilton",

year = "1998",

month = jan,

day = "6",

doi = "10.1109/INTMAG.1998.742073",

language = "English",

pages = "177--177",

note = "1998 IEEE International Magnetics Conference , INTERMAG ; Conference date: 06-01-1998 Through 09-01-1998",

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TY - CONF

T1 - A new concept of MR gradiometer heads

AU - Wang, Zhi Gang

AU - Helian, Na

AU - Mapps, Desmond J

AU - Wilton, David

PY - 1998/1/6

Y1 - 1998/1/6

N2 - 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 …

AB - 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 …

UR - https://ieeexplore.ieee.org/abstract/document/742073

U2 - 10.1109/INTMAG.1998.742073

DO - 10.1109/INTMAG.1998.742073

M3 - Paper

SP - 177

EP - 177

T2 - 1998 IEEE International Magnetics Conference

Y2 - 6 January 1998 through 9 January 1998

ER -

A new concept of MR gradiometer heads

Abstract

Conference

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