Exchange-coupled IrMn/CoZrNb soft underlayers for perpendicular recording media

Takenoiri, S.; Enomoto, K.; Sakai, Yuzo; Watanabe, Shinji

doi:10.1109/tmag.2002.801798

Cited by 15 publications

(8 citation statements)

References 9 publications

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“…A rapid thermal annealing (RTA) process [5], which is needed to align the magnetization of the SUL in the radial direction of the disk, was used. It has been also found that total noise generated from the SUL was reduced as the exchange bias field [6] increased. Since samples having relatively thin SUL thicknesses of 100 nm were used in those studies [5], [6], a much stronger pinning effect is needed to eliminate the spike noise for practical double-layered perpendicular media having a CoZrNb SUL thickness of at least 200 nm.…”

Section: Introductionmentioning

confidence: 92%

“…It has been also found that total noise generated from the SUL was reduced as the exchange bias field [6] increased. Since samples having relatively thin SUL thicknesses of 100 nm were used in those studies [5], [6], a much stronger pinning effect is needed to eliminate the spike noise for practical double-layered perpendicular media having a CoZrNb SUL thickness of at least 200 nm. However, the higher pinning effect might make it difficult to reverse the magnetization of SUL, or Manuscript in other words, may have a negative effect on the writability of the head.…”

Section: Introductionmentioning

confidence: 92%

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Recording performance of double-layered perpendicular recording media with an antiferromagnetic layer

Watanabe

Takenoiri

Sakai³

et al. 2003

IEEE Trans. Magn.

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For a double-layered perpendicular media having an antiferromagnetic layer, it has been reported that increasing the exchange bias field ex is effective to reduce spike noise generated from the domain walls of the soft magnetic underlayer (SUL). In this study, a high exchange-coupling energy ex of 0.345 erg/cm 2 was obtained by using the combination of a NiFeB underlayer and a CoFeNiB enhancement layer. By investigating the effects of ex on the recording performance, it was revealed that increasing ex caused the writability of a head to deteriorate. However, reducing the nonmagnetic interlayer thickness, which reduces the magnetic spacing between the head and the SUL, could minimize the deterioration in writability. In addition, when the writability was unaffected by ex , the signal-to-media-noise ratio was improved by the effect of SUL domain noise reduction.Index Terms-Antiferromagnetic layer, double-layered perpendicular recording media, recording performance, spike noise.

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Section: Introductionmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 92%

Recording performance of double-layered perpendicular recording media with an antiferromagnetic layer

Watanabe

Takenoiri

Sakai³

et al. 2003

IEEE Trans. Magn.

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“…There are various methods to eliminate domain walls. To make pseudo-single domain, repeated multilayer, exchange bias, and synthetic coupling structures have been fabricated [3][4][5][6][7]. For achieving higher areal density, the bit size in magnetic media will be smaller.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and noise properties of as-deposited and annealed soft underlayer

Yoon

Lee

Kong

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…There are many advantages of perpendicular system over longitudinal system, due to the interaction effect between SUL and recording layer, such as higher writing field, read-back signal amplitude, and lower noise [1,2]. Various SUL structures such as exchange bias type [3,4] and synthetic antiferromagnetic coupling type [5,6] have been introduced to suppress the SUL induced medium noise. Generally, with increasing SUL thickness, the H k is decreased.…”

Section: Introductionmentioning

confidence: 99%

Magnetic and recording performance of perpendicular magnetic media with new soft underlayer structure

Yoon

Kong

Lee

et al. 2007

Phys. Status Solidi (c)

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PACS 75.50. Ss, 85.70.Li In this study, we introduced the new concept SUL (Soft Underlayer) of PMR (Perpendicular Magnetic Recording) media for the superior recording performance. The recording performance of PMR media with various SUL types were investigated by Guzik spin stand. Our new concept SUL, which was denoted by the modified SAF (Synthetic Antiferromagnetic Coupling) structure, showed more excellent recording properties than those of others. These improved recording performances may be generated by decreased SUL noise and increased filed gradient with new SUL structure. The obtained results indicated that the modified SAF SUL structure can be helpful to high recording density.

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Exchange-coupled IrMn/CoZrNb soft underlayers for perpendicular recording media

Cited by 15 publications

References 9 publications

Recording performance of double-layered perpendicular recording media with an antiferromagnetic layer

Recording performance of double-layered perpendicular recording media with an antiferromagnetic layer

Magnetic and noise properties of as-deposited and annealed soft underlayer

Magnetic and recording performance of perpendicular magnetic media with new soft underlayer structure

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