Perpendicular magnetic recording

Iwasaki, S.

doi:10.1109/tmag.1980.1060546

Cited by 272 publications

(52 citation statements)

References 6 publications

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“…Arguments are given for a serpentinelike domain structure with a domain width about the same as the column diameter (0.1-0.3 pm), resulting in a 'chain of columns' model. Sputtered CoCr layers have already been applied as a perpendicular recording medium with extremely high density (Iwasaki 1980). The morphology and crystal structure and therefore the magnetic properties of the film depend strongly on the deposition and growth conditions.…”

mentioning

confidence: 99%

The magnetic domain structure of CoCr layers studied by neutron depolarisation

Hemmes

Lodder

Rekveldt

et al. 1984

J. Phys. D: Appl. Phys.

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Abstract. The domain structure of relatively thick RF-sputtered CoCr (81 : 19 at 9%) layers with a columnar morphology in the range of thickness 1-5 pm was investigated using a polarised neutron beam. On the basis of the results a model of straight domains running through the entire film thickness has to be rejected. Arguments are given for a serpentinelike domain structure with a domain width about the same as the column diameter (0.1-0.3 pm), resulting in a 'chain of columns' model. Sputtered CoCr layers have already been applied as a perpendicular recording medium with extremely high density (Iwasaki 1980). The morphology and crystal structure and therefore the magnetic properties of the film depend strongly on the deposition and growth conditions.Our films consist of conically shaped crystals or columns with c-axis textured hcpstructure (Lodder et al 1983). The crystal or column diameter increases almost as the square root of the film thickness. In order to understand the magnetisation process, domain studies are of great importance. If the exchange force is restricted to the columns the domain size coincides with the crystal diameter. The columns will act as single domain particles and a rotational switching mechanism is to be expected for the magnetisation process. In this case the domain structure is determined by a minimum of the magnetostatic energy and will appear as a kind of checkerboard pattern formed by the individual columns. In the case of a continuous model, where the exchange forces extend over the crystal boundaries, the magnetisation process is due to domain wall motion which is more or less hindered by the column boundaries.The domain dimensions of both particle and continuous models are too small to be observed by Kerr microscopy or the Bitter technique. The most suitable method for observing small domains is Lorentz transmission electron microscopy. A 1 MeV microscope has to be used for observing CoCr layers thicker than 0.1 pm, up to a maximum of 0.3 pm Iwasaki 1982, Grundy andAli 1983). A specially designed sample stage to exclude an external perpendicular field from the specimen during domain observations is essential Iwasaki 1982, Ohkoshi andKusuda 1983).Different domain configurations with in-plane magnetisation are observed in thin (<60 nm) CoCr layers (Grundy and Ali 1983, Ohkoshi and Kusuda 1983, Wielinga 1983. This can be explained by variations in the preparation methods. None of these films have a well oriented hcp c-axis. For a good textured layer (Co77Cr23), with a

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mentioning

confidence: 99%

The magnetic domain structure of CoCr layers studied by neutron depolarisation

Hemmes

Lodder

Rekveldt

et al. 1984

J. Phys. D: Appl. Phys.

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“…Many ideas have been developed to face this challenge. Among those concepts is to utilize perpendicular media [158,159], bit patterned media [160,161], and thermal (heat)-assisted magnetic recording [21]. For the case of perpendicular media, the magnetic orientation of the data bits is aligned vertically, perpendicular to the disk.…”

Section: Static Nanoscale Magnetic Structuresmentioning

confidence: 99%

High‐Resolution Soft X‐Ray Microscopy for Imaging Nanoscale Magnetic Structures and Their Spin Dynamics

Fischer

Mesler

2010

X‐Rays in Nanoscience

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“…A double-layered perpendicular magnetic recording medium [5][6][7], which is composed of a hard magnetic recording layer with perpendicular magnetic anisotropy and a soft magnetic underlayer (SUL), is a promising system for realizing an ultra high areal recording density. Therefore, we should pay attention not only to the recording layer but also the SUL in order to develop high performance perpendicular magnetic recording media.…”

Section: Soft Magnetic Underlayer By Electroless-deposition For Perpementioning

confidence: 99%