Comparative study of MR head designs with abutted vs. overlaid permanent magnet bias

Shen, Yong; Chen, W.; Jensen, William A.; Ravipati, D.; Retort, V.; Rottmayer, R.; Rudy, S.; Tan, Sheng; Yuan, S.W.

doi:10.1109/20.477544

Cited by 21 publications

(3 citation statements)

References 6 publications

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“…It is obvious that the individual stripe's response is asymmetric and the peak shifts right or left, respectively. The results for MR1, MR2, and DSMR are in a very good agreement with experimental measurements [7], [10]. Within a range of 30% of the track width (about 0.3 m) around the track centric line, PES is proportional to the misregistration , and when the head is aligned with the recorded track.…”

Section: General Principlesupporting

confidence: 85%

“…1. This means that the magnetizations scissor from their nominal parallel position, one is at 45 , the other is at 45 The nominal parallel magnetization configuration without sense current flowing is caused by permanent magnet films placed in the off-track wing regions (not shown in the figure) to control the magnetization orientation thus avoiding multidomain formation within the soft films [9], [10]. In Fig.…”

Section: Introductionmentioning

confidence: 99%

“…So far, studies mainly focus on how to reduce this asymmetry of the microtrack profile [10], [12], [13]. An example is the "dual stripe MR" configuration that yields symmetric offtrack responses [8].…”

Section: Introductionmentioning

confidence: 99%

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Estimation of track misregistration by using dual-stripe magnetoresistive heads

Wang

Liu

et al. 1998

IEEE Trans. Magn.

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We propose here a new concept of servoing with dual-stripe magnetoresistive (DSMR) heads. This paper examines the use of its asymmetric microtrack profile for estimating the data and providing servo information. The misregistration estimation algorithm is addressed for a class 4 partial response (PR4) equalized data channel. This requires a low-pass filter to reach an accurate estimation after enough samples are used. Simulation results for a specific head configuration are given which verify the estimating performance. The estimator estimates track misregistration precisely and quickly enough for practical purposes in a real storage system. Index Terms-Dual-stripe magnetoresistive (DSMR) heads, microtrack profile, partial response, position error signal (PES), servo. is with Tohoku University, Sendai 980-77 Japan.Publisher Item Identifier S 0018-9464(98)04728-1.

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Section: General Principlesupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Estimation of track misregistration by using dual-stripe magnetoresistive heads

Wang

Liu

et al. 1998

IEEE Trans. Magn.

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New Domain Biasing Techniques for Nanoscale Magneto-Electronic Devices

Pan

2007

Magnetic Nanostructures

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Micromagnetic modeling of overlaid exchange-biased giant magnetoresistance head

Zheng

You

2002

Journal of Applied Physics

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Overlaid exchange-biased structures for giant magnetoresistance head have been proposed and investigated. A home-developed three-dimensional micromagnetic modeling tool has been used to simulate synthetic antiferromagnetic spin valves of this type of biased structure with dimensions of 100 nm in width and 80 nm in height. Simulation results showed that, with a properly chosen antiferromagnetic material and structure, the exchange-biasing field could be made sufficient to suppress the noise without severely reducing the sensitivity. The sensitivity of overlaid exchange-biased spin valves is 1.73 times that of the abutted hard biased ones. Microtrack profiles showed that side reading effect could be suppressed effectively with an effective exchange-biasing field over 600 Oe.

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Comparative study of MR head designs with abutted vs. overlaid permanent magnet bias

Cited by 21 publications

References 6 publications

Estimation of track misregistration by using dual-stripe magnetoresistive heads

Estimation of track misregistration by using dual-stripe magnetoresistive heads

New Domain Biasing Techniques for Nanoscale Magneto-Electronic Devices

Micromagnetic modeling of overlaid exchange-biased giant magnetoresistance head

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