Quantitative evaluation of magnetocrystalline anisotropy of columnar grains and thickness of initial layer in CoCr-based perpendicular media

Saito, Shin; Hasegawa, D.; Hoshi, Fumihiko; Djayaprawira, D.D.; Takahashi, M.

doi:10.1063/1.1445467

Cited by 32 publications

(15 citation statements)

References 5 publications

(5 reference statements)

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“…V p from the data of the inset in Fig. 4 [8,9], where V p is the volume of Fe NPs assuming the sphere shape of Fe NP. All of the plots have a linear relationship, where ~190 emu/g Fe from the slopes and 3.8 nm-4.8 nm from the intercepts on the horizontal axis are obtained.…”

Section: Resultsmentioning

confidence: 99%

Effect of Nucleation and Growth Dynamics on Saturation Magnetization of Chemically Synthesized Fe Nanoparticles

Ogawa¹,

Seto²,

Hasegawa³

et al. 2011

Journal of Magnetics

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In order to obtain mono-dispersed Fe NPs with high saturation magnetization, quantitative analysis method to investigate the growth dynamics of the Fe NPs synthesized by a conventional thermal decomposition method has been developed. As a result, fast nucleation process promotes formation of ~4 nm of initial nucleus with a non-equilibrium phase, resulting in low saturation magnetization. And slow particle growth with atomic-scaled surface precipitation mode (< 100 atoms/(min·nm 2 )) can form the growth layer on the surface of initial nucleus with high saturation magnetization (~190 emu/g Fe ) as an equilibrium a phase of Fe. Therefore, higher stabilization of small initial nucleus generated just after the injection of Fe(CO) 5 should be one of the key issues to achieve much higher M s of Fe NPs.

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Section: Resultsmentioning

confidence: 99%

Effect of Nucleation and Growth Dynamics on Saturation Magnetization of Chemically Synthesized Fe Nanoparticles

Ogawa¹,

Seto²,

Hasegawa³

et al. 2011

Journal of Magnetics

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“…Lattice constants and of the hcp grains drastically change in the range from 150 C to 200 C. These data suggest that in CoCr film with C(1 nm)-seedlayer, the Cr-rich hcp grains was formed at lower than 150 C, and at more than 200 C, hcp grains with less-Cr are formed due to the Cr segregation. plot [10]. For the media [ Fig.…”

Section: B Effect Of C Seedlayer On Phase Formation In Cocr Layermentioning

confidence: 99%

Effects of very thin carbon seedlayer on formation of hcp phase for CoCrPtB/Co/sub 60/Cr/sub 40/ perpendicular magnetic recording media

2002

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This paper reports on significant improvement of magnetic properties for CoCrPtB/Co 60 Cr 40 perpendicular recording media by utilizing very thin C seedlayer even with the thickness of less than 1 nm. This is caused by the following microstructural characteristic: 1) the C seedlayer, heated to higher than 200 C, reacts with CoCr intermediate layer, and results in the formation of nanocrystalline layer with the thickness of about 6 nm; 2) Cr-deprived hcp grains with Cr segregation structure grow on the nanocrystalline layer without forming -phase grains in the intermediate layer; 3) CoCrPtB magnetic layer epitaxially grows on the intermediate layer without forming initial layer, which behaves as soft ferromagnetic layer and degrades magnetic properties of the media. Index Terms--phase, Co 60 Cr 40 intermediate layer, epitaxial growth, very thin C seedlayer.

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“…where K effective u> can be considered as the averaged perpendicular magnetic anisotropy over the hard magnetic layer and its initial soft layer, N d and M s refers to the demagnetisation factor and saturation magnetisation respectively. Saito et al, had aptly derived an expression to compute the intrinsic magnetocrystalline anisotropy, K grain u ; of only the hard magnetic FePt layer and initial growth layer thickness, t initial [13].…”

Section: Article In Pressmentioning

confidence: 99%

“…This may be attributed to the increase of the FCT-FePt (2 0 0) component and the emergence of FCT-FePt (1 1 1) Few studies have been attempted to evaluate the thickness of the initial growth layer and intrinsic magnetocrystalline constant of the FePt films. A methodology has been proposed to compute these attributes [13]. where K effective u> can be considered as the averaged perpendicular magnetic anisotropy over the hard magnetic layer and its initial soft layer, N d and M s refers to the demagnetisation factor and saturation magnetisation respectively.…”

Section: Article In Pressmentioning

confidence: 99%

Thickness dependence of structural and magnetic properties of FePt films

Lim¹,

Chen²,

Wang³

2004

Journal of Magnetism and Magnetic Materials

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Quantitative evaluation of magnetocrystalline anisotropy of columnar grains and thickness of initial layer in CoCr-based perpendicular media

Abstract: Articles you may be interested inReduction of magnetic grain size of perpendicular recording media with CoCrW seed layer

Cited by 32 publications

References 5 publications

Effect of Nucleation and Growth Dynamics on Saturation Magnetization of Chemically Synthesized Fe Nanoparticles

Effect of Nucleation and Growth Dynamics on Saturation Magnetization of Chemically Synthesized Fe Nanoparticles

Effects of very thin carbon seedlayer on formation of hcp phase for CoCrPtB/Co/sub 60/Cr/sub 40/ perpendicular magnetic recording media

Thickness dependence of structural and magnetic properties of FePt films

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