Structure analysis of CoPt alloy film with metastable ordered phases ofL11andBhformed on Ru(0001) underlayer

Ohtake, Mitsuru; Suzuki, Daisuke; Kirino, Fumiyoshi; Futamoto, Masaaki

doi:10.1051/epjconf/20147506003

Cited by 4 publications

(1 citation statement)

References 10 publications

(17 reference statements)

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“…Concerning the preparation and the characterization of other-type ordered alloy films of RT5, L11-CoPt, Bh-CoPt, and DO19-Co3Pt, they are reported in the references [130][131][132][133][134][135][136][137][138][139][162][163][164][165][166][167][168][169][170][171][172] .…”

Section: D019 Co3ptmentioning

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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Section: D019 Co3ptmentioning

confidence: 99%

Development of Media Nanostructure for Perpendicular Magnetic Recording

Futamoto

Ohtake

2017

J. Magn. Soc. Jpn.

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Perpendicularly magnetized epitaxial Co/Ni multilayers grown on Ru(0001) layers by alternate monoatomic layer deposition

Ito

Kikuchi

Seki

et al. 2022

Journal of Magnetism and Magnetic Materials

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Thin film epitaxial [111] Co$$_{50}$$Pt$$_{50}$$: structure, magnetisation, and spin polarisation

Satchell,

Gupta,

Maheshwari

et al. 2023

Sci Rep

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Ferromagnetic films with perpendicular magnetic anisotropy are of interest in spintronics and superconducting spintronics. Perpendicular magnetic anisotropy can be achieved in thin ferromagnetic multilayer structures, when the anisotropy is driven by carefully engineered interfaces. Devices with multiple interfaces are disadvantageous for our application in superconducting spintronics, where the current perpendicular to plane is affected by the interfaces. Robust intrinsic PMA can be achieved in certain Co$$_x$$ x Pt$$_{100-x}$$ 100 - x alloys and compounds at any thickness, without increasing the number of interfaces. Here, we grow equiatomic Co$$_{50}$$ 50 Pt$$_{50}$$ 50 and report a comprehensive study on the structural, magnetic, and spin-polarisation properties in the $$L1_1$$ L 1 1 and $$L1_0$$ L 1 0 ordered compounds. Primarily, interest in Co$$_{50}$$ 50 Pt$$_{50}$$ 50 has been in the $$L1_0$$ L 1 0 crystal structure, where layers of Pt and Co are stacked alternately in the [100] direction. There has been less work on $$L1_1$$ L 1 1 crystal structure, where the stacking is in the [111] direction. For the latter $$L1_1$$ L 1 1 crystal structure, we find magnetic anisotropy perpendicular to the film plane. For the former $$L1_0$$ L 1 0 crystal structure, the magnetic anisotropy is perpendicular to the [100] plane, which is neither in-plane or out-of-plane in our samples. We obtain a value for the ballistic spin polarisation of the $$L1_1$$ L 1 1 and $$L1_0$$ L 1 0 Co$$_{50}$$ 50 Pt$$_{50}$$ 50 to be $$47\pm 3\%$$ 47 ± 3 % .

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Structure analysis of CoPt alloy film with metastable ordered phases ofL1₁andB_hformed on Ru(0001) underlayer

Cited by 4 publications

References 10 publications

Development of Media Nanostructure for Perpendicular Magnetic Recording

Development of Media Nanostructure for Perpendicular Magnetic Recording

Perpendicularly magnetized epitaxial Co/Ni multilayers grown on Ru(0001) layers by alternate monoatomic layer deposition

Thin film epitaxial [111] Co$$_{50}$$Pt$$_{50}$$: structure, magnetisation, and spin polarisation

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