Surface Roughness Reduction in $L 1_{0}$ Ordered FePd Alloy Thin Films Formed on MgO Single-Crystal Substrates with Different Orientations

Itabashi, Akira; Ohtake, Mitsuru; Ouchi, Shouhei; Kirino, Fumiyoshi; Futamoto, Masaaki

doi:10.1109/tmag.2012.2197814

Cited by 14 publications

(12 citation statements)

References 7 publications

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“…Similar results on the variant configurations and the order degrees are confirmed for the magnetic materials of 40 nm thickness prepared by employing a two-step process which consists of low temperature deposition at 200 °C followed by high temperature annealing at 600 °C 153,177) . When the magnetic materials were deposited at 200 °C, the films grew epitaxially with the disordered A1 structure.…”

Section: Methodssupporting

confidence: 72%

“…Considering that the film morphology is influenced during the film deposition process, a two-step process technique consisting of a low temperature film deposition followed by a high temperature annealing for L10 ordering has been investigated to prepare an L10 ordered film with improved surface flatness 153,174,175,177) . Figure 20 compares the surface structures of FePd thin films of 2 -40 nm thicknesses observed by atomic force microscopy (AFM).…”

Section: Methodsmentioning

confidence: 99%

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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: Methodssupporting

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Development of Media Nanostructure for Perpendicular Magnetic Recording

Futamoto

Ohtake

2017

J. Magn. Soc. Jpn.

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“…The base pressures were lower than 4 × 10 -7 Pa. The detail of sample preparation is reported in our previous paper [6]. FePd films of 40 nm thickness were deposited on MgO(001) substrates at 200 ºC.…”

Section: Methodsmentioning

confidence: 99%

“…%) alloy epitaxial thin films with very flat surfaces, which are obtained on MgO(001) singlecrystal substrates by employing a two-step process; lowtemperature deposition at 200 ºC followed by hightemperature annealing at 400 ºC [6]. Very flat surface is required in FMR measurements to evaluate intrinsic magnetic relaxation in order to avoid extrinsic effect by surface roughness [7].…”

Section: Introductionmentioning

confidence: 99%

Gilbert damping constant of FePd alloy thin films estimated by broadband ferromagnetic resonance

Kawai

Itabashi

Ohtake

et al. 2014

EPJ Web of Conferences

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Abstract. Magnetic relaxation of FePd alloy epitaxial thin films with very flat surfaces prepared on MgO(001) substrate are measured by in-plane broadband ferromagnetic resonance (FMR). Magnetic relaxation is investigated as for FMR absorption peak by frequency sweep measurements. is calculated by using the measured . Gilbert damping constant, , is estimated by employing a straight line fitting of the resonant frequency dependence of . The value for an FePd film deposited at 200 ˚C, which shows disordered A1 structure, is 0.010 and 0 , which is frequency independent part of , is 10 Oe. The value for a film annealed at 400 ˚C, which shows partially L1 0 ordered structure (S=0.32), is 0.013, which is slightly larger than that for the disorder A1 structure film. However, 0 for the annealed film is 85 Oe, which is much larger than that for the film with disordered structure. The results show that the magnetic relaxation of the 400 ˚C annealed film is mainly dominated by 0 , which is related with magnetic in-homogeneity caused by the appearance of perpendicular anisotropy of partially ordered phase.

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“…[3][4][5] The authors have shown that a twostep process consisting of low temperature film formation followed by high temperature annealing is effective for the preparation of L1 0 -FePt thin film with an improved surface flatness. 6,7 When an Fe-Pt alloy thin film is formed on an oxide substrate such as MgO(001) single-crystal at low temperatures where the impinging atom migration is limited, the film morphology tends to be continuous with small surface undulations. By heating the film at a higher temperature, migration of atoms within the film proceeds to form an L1 0 -ordered structure keeping the film morphology.…”

Section: Introductionmentioning

confidence: 99%

Preparation of c-axis perpendicularly oriented ultra-thin L1-FePt films on MgO and VN underlayers

2018

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Ultra-thin L10-FePt films of 2 nm average thickness are prepared on (001) oriented MgO and VN underlayers epitaxially grown on base substrate of SrTiO3(001) single crystal. Detailed cross-sectional structures are observed by high-resolution transmission electron microscopy. Continuous L10-FePt(001) thin films with very flat surface are prepared on VN(001) underlayer whereas the films prepared on MgO(001) underlayer consist of isolated L10-FePt(001) crystal islands. Presence of misfit dislocation and lattice bending in L10-FePt material is reducing the effective lattice mismatch with respect to the underlayer to be less than 0.5 %. Formation of very flat and continuous FePt layer on VN underlayer is due to the large surface energy of VN material where de-wetting of FePt material at high temperature annealing process is suppressed under a force balance between the surface and interface energies of FePt and VN materials. An employment of underlayer or substrate material with the lattice constant and the surface energy larger than those of L10-FePt is important for the preparation of very thin FePt epitaxial thin continuous film with the c-axis controlled to be perpendicular to the substrate surface.

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Surface Roughness Reduction in $L 1_{0}$ Ordered FePd Alloy Thin Films Formed on MgO Single-Crystal Substrates with Different Orientations

Cited by 14 publications

References 7 publications

Development of Media Nanostructure for Perpendicular Magnetic Recording

Development of Media Nanostructure for Perpendicular Magnetic Recording

Gilbert damping constant of FePd alloy thin films estimated by broadband ferromagnetic resonance

Preparation of c-axis perpendicularly oriented ultra-thin L1-FePt films on MgO and VN underlayers

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