Perpendicular Recording Media for Ultra-High-Density Magnetic Recording

Futamoto, Masaaki; Hirayama, Yoshiyuki; Honda, Yukio; Kikukawa, Atsushi

doi:10.1007/978-94-010-0624-8_5

Cited by 3 publications

(9 citation statements)

References 29 publications

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“…12 shows an example of such observation. Soft magnetic back-layer of amorphous CoNbZr or FeTaC with fine grain structure was confirmed to be suitable for the media for high-density magnetic recording [1,21].…”

Section: Improvement Of Soft Magnetic Back-layermentioning

confidence: 93%

“…The use of PMR enables us to increase the areal recording density more than several times than that achievable with the conventional longitudinal magnetic recording [1]. The areal density of 230 Gb/in 2 has been demonstrated [2] and the feasibility of several hundreds Gb/in 2 areal density with PMR are now being challenged.…”

Section: Introductionmentioning

confidence: 99%

“…The PMR is now recognized as the recording scheme with which we can increase the recording areal density while coping with some of the arising difficulties such as the writing head capability, the super-paramagnetic effect of recording media and etc. [1,4]. The present paper briefly reviews the development of perpendicular magnetic recording media that is the key technology for high-density magnetic recording.…”

Section: Introductionmentioning

confidence: 99%

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Perpendicular Magnetic Recording

Litvinov¹,

Khizroev²

2005

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Section: Improvement Of Soft Magnetic Back-layermentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Perpendicular Magnetic Recording

Litvinov¹,

Khizroev²

2005

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“…However, as the areal density increased beyond 10 Gb/in 2 , the signal decay problem associated with thermal instability with LMR [7][8][9] gradually narrowed the allowance in HDD product design. Triggered by a highdensity magnetic recording demonstration using PMR 10) and by the developments of PMR media technology which solved the engineering issues [11][12][13][14][15][16][17][18] , activities toward realization of HDD products based on PMR emerged drastically in the magnetic recording community from the year around 2000 and the first PMR-HDD product was shipped in 2005 with an areal density of 133 Gb/in 2 19, 20) . The areal density of PMR-HDD increased since then about 10 times and the technologies for achieving 5 -10 Tb/in 2 areal densities are investigated in the cutting edge research laboratories 21,22) .…”

Section: Introductionmentioning

confidence: 99%

“…The shift was necessary for increasing the Ku value of recording layer, which was directly related with increasing the perpendicular coercivity. When the layer thickness was decreased for Co-alloy recording layer materials to be less than 50 nm, a notable decrease in perpendicular coercivity was observed and the decrease depended on the underlayer material 12,45,46) . Careful examinations of the interface between the Co-alloy recording layer and the underlayer revealed that there was an atomically disordered region of a few nanometers around the interface 38,46,47) .…”

Section: Introductionmentioning

confidence: 99%

Development of Media Nanostructure for Perpendicular Magnetic Recording

Futamoto

Ohtake

2017

J. Magn. Soc. Jpn.

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The review covers the research and development of perpendicular media nanostructure focusing on the recording layer. The recording layer material includes the Co-alloys with hcp structure, the magnetic multilayers, and the alloys with ordered structures that have high magneto-crystalline anisotropies (Ku). The technologies of underlayer or interlayer for aligning the easy magnetization axis of magnetic crystal grain perpendicular to the film plane are briefly reviewed including the high Ku magnetic materials for future recording media.Observations of compositional and magnetization structures in sub-µm scale have played important roles in improving the recording layer. Typical data on these characteristics are explained in relation to the media structure improvements. Considering that high Ku magnetic materials will be employed in future recording media, basic experimental results related in controlling the easy magnetization axis and in keeping the surface flatness of L10-ordered magnetic materials are explained. Future possibilities for increasing the areal density beyond 1 Tb/in 2 by improving the magnetic material and the nanostructure of recording layer are also discussed.

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Evolution of magnetism on a curved nano-surface

et al. 2015

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To design custom magnetic nanostructures, it is indispensable to acquire precise knowledge about the systems in the nanoscale range where the magnetism forms. In this paper we present the effect of a curved surface on the evolution of magnetism in ultrathin iron films. Nominally 70 Å thick iron film was deposited in 9 steps on 3 different types of templates: a) A monolayer of silica spheres with 25 nm diameter b) a monolayer of silica spheres with 400 nm diameter and for comparison a flat silicon substrate. The in-situ iron evaporation took place in an ultrahigh vacuum chamber using molecular beam epitaxy technique. After the evaporation steps, time differential nuclear forward scattering spectra, grazing incidence small angle X-ray scattering images and X-ray reflectivity curves were recorded. In order to reconstruct and visualize the magnetic moment configuration in the iron cap formed on top of the silica spheres, micromagnetic simulations were performed for all iron thicknesses. We found a great influence of the template topography on the onset of the magnetism and on the developed magnetic nanostructure. We observed individual magnetic behaviour for the 400 nm spheres which was modelled by vortex formation and collective magnetic structure for the 25 nm spheres where magnetic domains spread over several particles. Depth selective nuclear forward scattering measurements showed that the formation of magnetism begins at the top region of the 400 nm spheres contrary to the 25 nm particles were the magnetism first appears in the region where the spheres are in contact with each other.

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Perpendicular Recording Media for Ultra-High-Density Magnetic Recording

Cited by 3 publications

References 29 publications

Perpendicular Magnetic Recording

Perpendicular Magnetic Recording

Development of Media Nanostructure for Perpendicular Magnetic Recording

Evolution of magnetism on a curved nano-surface

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