Inductive write heads using high moment FeAlN poles

Jayasekara, W.; Khizroev, Sakhrat; Kryder, M.H.; Weresin, W.; Kasiraj, P.; Fleming, J. A.

doi:10.1109/20.750616

Cited by 8 publications

(5 citation statements)

References 12 publications

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“…The parameter that fit the readback signal amplitude had a value identical to that predicted by 3-D micromagnetic modeling for an A-DMR head with a track width of 2 m and a stripe height of 2 m. The other fitting parameter, the spacing , had a value well predicted with the Williams-Comstock model as indicated in Table II. Because the recording process on both longitudinal media was optimized with a write current that produced an overwrite above 40 dB and a hard transition shift of less than 3 nm [18], it is a reasonable assumption to consider that the transition parameter did not change with the bit length. This assumption is supported by good agreement between the fitting spacing values and those obtained by combining flying height experimental results with transition parameter values calculated with (8).…”

Section: Discussionmentioning

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: Discussionmentioning

confidence: 99%

“…The thin-film inductive head used high magnetization poles of FeAlN [18] that were trimmed by focus ion beam etching to a width of 2.5 m [9], [18]. The recording signals were sensed with a DMR head having a track width of 2 m. Both write and read heads used nano-sliders.…”

Section: A Longitudinal Mediamentioning

confidence: 99%

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

Trindade

Kryder

2002

IEEE Trans. Magn.

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“…31 Thus, by reducing the throat height, the relative contribution of the throat region to the net reluctance of the magnetic circuit is also reduced and therefore the overall efficiency of the system is increased. Also, as described below, by reducing the throat height, the recording field at saturation is increased.…”

Section: Throat Height Dependencementioning

confidence: 99%

Perpendicular magnetic recording: Writing process

Khizroev

Litvinov

2004

Journal of Applied Physics

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Recording, noise, and medium microstructure in perpendicular recording with a soft magnetic underlayerIn this article, a detailed overview of the methodology to design a write transducer for recording onto perpendicular media at areal densities beyond 1 Tbit/in. 2 is presented. The two basic modes of perpendicular recording, single-layer recording media in combination with a ring type head and double-layer recording media with a soft underlayer in combination with a single pole head, are compared with each other theoretically and experimentally. Moreover, perpendicular recording is compared to longitudinal recording from the perspective of the writing process. The system efficiency is redefined for perpendicular recording to take into account the critical role of the soft underlayer. The effects of using ''soft'' magnetic shields around the trailing pole are analyzed. It is shown that at least a factor of 2 increase in the field can be obtained at areal densities beyond 500 Gbit/in. 2 if shields are used. Such an open issue as the skew angle sensitivity in perpendicular recording is analyzed. It is shown that using soft magnetic shields around the trailing pole substantially improves the skew angle sensitivity. Moreover, using shields substantially improves the system efficiency and to some degree fulfills the role of the soft underlayer in perpendicular recording.

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“…In the past demonstrations of areal densities, which were below 50 Gb/in , only electroplated materials were reportedly used for the write poles [2]- [5]. In this study, a sputter deposited high moment flux enhancement layer [6] was used to achieve the writer performance needed for a recording density of 63.2 Gb/in .…”

Section: Introductionmentioning

confidence: 98%

Inductive write heads for greater than 60 Gb/in/sup 2/ demonstration

et al. 2001

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Sputter deposited FeRhN films with a value of more than 20 kG were used as high moment flux enhancement layer in the write element in order to achieve a recording density of 63.2 Gb/in 2 . This layer was disposed between write gap and upper portion of the top pole, which was made of Ni 45 Fe 55 with a of 16 kG. A 36 dB overwrite and nonlinear transition shift of less then 20 dB were obtained at this recording density. A finite element model was used to calculate the longitudinal field and field gradient at the medium location. The results suggested significant increases of both by incorporating the flux enhancement layer.

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Inductive write heads using high moment FeAlN poles

Cited by 8 publications

References 12 publications

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

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

Perpendicular magnetic recording: Writing process

Inductive write heads for greater than 60 Gb/in/sup 2/ demonstration

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