Microstructure and magnetic properties of CoCr thin films formed on Ge layer

Futamoto, Masaaki; Honda, Yukio; Kakibayashi, Hiroshi; Yoshida, Kazuo

doi:10.1109/tmag.1985.1064012

Cited by 119 publications

(22 citation statements)

References 10 publications

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“…Thin films of CoCrPt, an alloy which has received significant attention for perpendicular magnetic recording media [35,36], were studied. The anisotropy was oriented perpendicular to the film plane by growing the Co grains epitaxially on a Ti underlayer so the Co c axis was oriented out of plane [37,38].…”

Section: Introductionmentioning

confidence: 99%

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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Ferromagnetic domain patterns and three-dimensional domain-wall configurations in thin CoCrPt films with perpendicular magnetic anisotropy were studied in detail by combining magnetic force microscopy and polarized neutron reflectometry with micromagnetic simulations. With the first method, lateral dimension of domains with alternative magnetization directions normal to the surface and separated by domain walls in 20-nm-thick CoCrPt films were determined in good agreement with micromagnetic simulations. Quantitative analysis of data on reflectometry shows that domain walls consist of a Bloch wall in the center of the thin film, which is gradually transformed into a pair of Néel caps at the surfaces. The width and in-depth thickness of the Bloch wall element, transition region, and Néel caps are found consistent with micromagnetic calculations. A complex structure of domain walls serves to compromise a competition between exchange interactions, keeping spins parallel, magnetic anisotropy orienting magnetization normal to the surface, and demagnetizing fields, promoting in-plane magnetization. It is shown that the result of such competition strongly depends on the film thickness, and in the thinner CoCrPt film (10 nm thick), simple Bloch walls separate domains. Their lateral dimensions estimated from neutron scattering experiments agree with micromagnetic simulations.

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Section: Introductionmentioning

confidence: 99%

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

et al. 2014

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“…Various underlayer materials were investigated to promote the c-axis oriented crystal growth and materials like Ti, Ta, Si, and Ge were found to be suitable for this purpose [7,8]. CoCr-alloy layer deposited on a Ti underlayer [9].…”

Section: Improvement Of Microstructure Of Co-alloy Recording Layermentioning

confidence: 99%

“…The perpendicular magnetic anisotropy was greatly enhanced by introducing such an underlayer. This type of highly c-axis oriented medium was used for high density magnetic recording demonstrations with PMR in the mid '80s [7,10].…”

Section: Improvement Of Microstructure Of Co-alloy Recording Layermentioning

confidence: 99%

Perpendicular Magnetic Recording

1994

J. Magn. Soc. Jpn.

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“…To enhance the crystal nucleation with the c-axis perpendicular to the substrate surface, underlayer materials were investigated around middle 1980's, and the materials like hcp-Ta 27) , hcp-Ti 28,29) , amorphous-Ge 30) were found suitable for this purpose. The underlayer has to offer a surface condition for Coalloy crystal to nucleate with the basal (0001) parallel to the surface through hetero-epitaxial growth.…”

Section: Introductionmentioning

confidence: 99%

“…Such nucleation of Co-alloy crystal is also possible on a neutral-type surface that promotes free nucleation of Cocrystal, where the (0001) basal plane with the lowest surface energy tends to be favored parallel to the nonmagnetic underlayer surface. Underlayer materials were then extended to nonmagnetic hcp-CoCr 31,32) , hcpRu 30,33) , fcc-Au, fcc-Al 34) , fcc-Pt 35) , etc. and dualunderlayer structures; Ti/Ge 36) , CoCr/TiCr 37,38) , Co3O4/Pt 35) , Pt/Ti 39) , Pd/Ti 40) , CoCrRu/TiCr 41) , Ru/Ta 42,43) , Ru-oxide/Ru 44) , etc.…”

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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Microstructure and magnetic properties of CoCr thin films formed on Ge layer

Cited by 119 publications

References 10 publications

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Domain-wall structure in thin films with perpendicular anisotropy: Magnetic force microscopy and polarized neutron reflectometry study

Perpendicular Magnetic Recording

Development of Media Nanostructure for Perpendicular Magnetic Recording

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