Low noise FeAlSi soft magnetic under-layer for CoPtCrO double-layered perpendicular recording media

Hikosaka, T.; Nakamura, Fumihiko; Oikawa, Shoko; Takeo, Akihiko; Tanaka, Y.

doi:10.1109/20.950908

Cited by 17 publications

(7 citation statements)

References 5 publications

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“…2 shows an example of the time decay of the reproduced signal from CoPtCrO/[FeAlSi/C]n double-layer perpendicular media at room temperature [4]. A multilayered [FeAlSi/C]n underlayer structure was developed as a lownoise underlayer candidate [6], [7]. In the wide time range from 0.2 to 5 10 s, the signal decay rate was found better than 0.03 dB/decade even at low 10 kFCI (0.39 kfc/mm) recording density.…”

Section: Design Concept Of Double-layer Perpendicular Mediamentioning

confidence: 99%

Dynamic read/write performance characterization of perpendicular recording

2002

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Double-layer perpendicular recording media employing high squareness magnetic properties have been developed and tested with single-pole perpendicular heads. Dynamic performance tests revealed that double-layer perpendicular media exhibited high output signal, high resolution, and superior write performance at the same time. Signal decay tests also indicated superior thermal stability. Drive integration test with a 42 kTPI (1654 track/mm) system showed comparable tracking servo performance to conventional systems.

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Section: Design Concept Of Double-layer Perpendicular Mediamentioning

confidence: 99%

Dynamic read/write performance characterization of perpendicular recording

2002

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“…114 The reduction of roughness was attributed to a reduction in the grain growth. Hikosaka et al have investigated FeAlSi/ C multilayers and have observed a reduction in atomic force microscopy ͑AFM͒ roughness and the noise.…”

Section: Noise Of Sulmentioning

confidence: 99%

Perpendicular recording media for hard disk drives

Piramanayagam

2007

Journal of Applied Physics

415

168

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Perpendicular recording technology has recently been introduced in hard disk drives for computer and consumer electronics applications. Although conceptualized in the late 1970s, making a product with perpendicular recording that has competing performance, reliability, and price advantage over the prevalent longitudinal recording technology has taken about three decades. One reason for the late entry of perpendicular recording is that the longitudinal recording technology was quite successful in overcoming many of its problems and in staying competitive. Other reasons are the risks, problems, and investment needed in making a successful transition to perpendicular recording technology. Iwasaki and co-workers came up with many inventions in the late 1970s, such as single-pole head, CoCr alloy media with a perpendicular anisotropy, and recording media with soft magnetic underlayers [S. Iwasaki and K. Takemura, IEEE Trans. Magn. 11, 1173 (1975); S. Iwasaki and Y. Nakamura, IEEE Trans. Magn. 14, 436 (1978); S. Iwasaki, Y. Nakamura, and K. Ouchi, IEEE Trans. Magn. 15, 1456 (1979)]. Nevertheless, the research on perpendicular recording media has been intense only in the past five years or so. The main reason for the current interest comes from the need to find an alternative technology to get away from the superparamagnetic limit faced by the longitudinal recording. Out of the several recording media materials investigated in the past, oxide based CoCrPt media have been considered a blessing. The media developed with CoCrPt-oxide or CoCrPt–SiO2 have shown much smaller grain sizes, lower noise, and larger thermal stability than the perpendicular recording media of the past, which is one of the reasons for the success of perpendicular recording. Moreover, oxide-based perpendicular media have also overtaken the current longitudinal recording media in terms of better recording performance. Several issues that were faced with the soft underlayers have also been solved by the use of antiferromagnetically coupled soft underlayers and soft underlayers that are exchange coupled with an antiferromagnetic layer. Significant improvements have also been made in the head design. All these factors now make perpendicular recording more competitive. It is expected that the current materials could theoretically support areal densities of up to 500–600Gbits∕in.2. In this paper, the technologies associated with perpendicular recording media are reviewed. A brief background of magnetic recording and the challenges faced by longitudinal recording technology are presented first, followed by the discussions on perpendicular recording media. Detailed discussions on various layers in the perpendicular recording media and the recent advances in these layers have been made. Some of the future technologies that might help the industry beyond the conventional perpendicular recording technology are discussed at the end of the paper.

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“…Media noise, which is correlated with coercive force, must be reduced to enable soft magnetic multilayers to be used as backlayers. An FeAlSi soft magnetic multilayer with Ti intermediate layers has higher media noise and larger coercive force than an FeAlSi multilayer with C intermediate layers [1]. We previously reported that an as-deposited FeCSi soft magnetic multilayer with Cr or Ti intermediate layers, which has high media noise, has clear X-ray diffraction (XRD) peaks from the Fe phase although there are no XRD peaks in an as-deposited FeCSi multilayer with C intermediate layers, which has low media noise [4].…”

Section: Introductionmentioning

confidence: 98%

“…These multilayers effectively suppress the amplitude of spike noise [1][2][3][4]. Media noise, which is correlated with coercive force, must be reduced to enable soft magnetic multilayers to be used as backlayers.…”

Section: Introductionmentioning

confidence: 99%