Dual stripe magnetoresistive heads for high density recording

Anthony, Thomas; Naberhuis, S.; Brug, J. A.; Bhattacharyya, Manoj K.; Tran, L.; Hesterman, V. W.; Lopatin, G.G.

doi:10.1109/20.312277

Cited by 27 publications

(3 citation statements)

References 9 publications

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“…The readback signals for square-wave recording at any bit length, , can be fit with the solutions of (6) if the principle of superposition applies (7) where the summation is over the spatial frequency components.…”

Section: Head Design and Theorymentioning

confidence: 99%

“…Consequently, this device needed one set of leads and no differential amplifier. Moreover, it could exhibit better linear resolution than concurrent magnetoresistive read heads, such as the shunt-biased [6] and dual-stripe magnetoresistive (DSMR) [7] shorting between the shields and the stripe and/or between the stripes caused by smearing. On the other hand, the DMR head did not exhibit the common-mode noise rejection of the earlier gradiometers.…”

Section: Introductionmentioning

confidence: 99%

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Narrow-track differential head: performance on longitudinal and perpendicular disk media

Trindade

Kryder

2002

IEEE Trans. Magn.

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This paper describes experimental spin-stand tests of a narrow-track differential head, reading back square-wave patterns on longitudinal and perpendicular recording media. The low linear density response of the transducer to recording signals of longitudinal and perpendicular media consisted of bipolar and unipolar pulses, respectively. The paper also presents the head responses to dibits and magnetic patterns recorded in longitudinal media. The head attained the highest linear resolution with a longitudinal thin-film medium, having an areal magnetic moment of = 0 5 memu/cm 2 and a coercivity of = 3 0 kOe. The nominal full dynamic range of the transducer was tested with a longitudinal medium having= 1 memu/cm 2 , but at the expense of a lower linear resolution. The transducer showed a considerably lower linear resolution, when reading back magnetic patterns of a dual-layer perpendicular medium. The experimental time-domain and spectral responses of the dual magnetoresistive head agreed well with those predicted by theory.Index Terms-Differential magnetoresistive head, dual magnetoresistive head, magnetic recording heads, magnetoresistive heads, perpendicular recording.

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Section: Head Design and Theorymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Narrow-track differential head: performance on longitudinal and perpendicular disk media

Trindade

Kryder

2002

IEEE Trans. Magn.

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“…An issue important to the disk drive industry, is to identify at what linear and track density that AMR devices must give way to GMR devices to sustain higher areal densities. In this paper, a micromagnetic analysis is performed for the SAL/MR and dual-stripe MR (DSMR) heads, the two currently utilized AMR structures for disk drive applications[11 [2] [3]. Emphasis is placed on the performance at high linear and track densities.…”

Section: Introductionmentioning

confidence: 99%

Recording limitations for SAL/MR and dual-stripe heads

Zhu

O’Connor²

1996

IEEE Trans. Magn.

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A micromagnetic modeling analysis is performed to investigate the areal recording density limitations of the soft adjacent layer (SAL) biased and dual-stripe (DS) magnetoresistive recording head structures. The simulation analysis yielded four principle results: First, the higher output advantage of the DSMR head structure over the SAL head structure is largely due to the ohmic shunting loss of the SAL layer in the present SAL heads. Second, both the SAL and DSMR head structures are capable of supporting read track width as narrow as W4.5 pm. Third, in order to support high linear densities, the spacing between the two MR stripes in the DSMR structure must be narrowed to obtain the adequate spectral response. There is, however, a corresponding amplitude reduction that is due to the magnetostatic interaction between the two stripes. Fourth, the track width broadening inherent in the DSMR structure when the two MR films are misaligned can he eliminated with a sense current inversion.

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