Assembly of high-anisotropy L10 FePt nanocomposite films

Sellmyer, David J.; Xu, Yanchao; Sui, Yucheng; Zhou, Jian; Skomski, Ralph

doi:10.1016/j.jmmm.2006.01.064

Cited by 27 publications

(16 citation statements)

References 29 publications

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“…However, the magnetization evaluated per weight 40,41) was indicated and no information on the packing density of cluster assemblies. Since the magnetization per volume is necessary to estimate BH MAX , we cannot compare the present results with the reported ones.…”

Section: Discussionmentioning

confidence: 99%

“…So far, FePt particles and Fe particles/FePt thin film hybrids prepared by cluster deposition methods have been reported to show excellent hard magnetic properties. 40,41) In this study, we prepared FePt cluster/FeCo film and FeCo cluster/FePt film laminated hybrids using both a PGCCD system and a helicon-plasma-type-sputter-deposition system and observed their structures and magnetic properties. Based on these result, we are discussing a perspective of these cluster/film laminated hybrids for the application to spring magnets.…”

Section: )mentioning

confidence: 99%

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Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

et al. 2012

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Both FePt cluster/FeCo film and FeCo cluster/FePt film laminated hybrids have been prepared by combination of a plasma-gascluster-deposition and a helicon-plasma sputter-deposition and studied by X-ray diffraction and magnetization measurements. In FePt cluster/ FeCo film laminated hybrids, M S increases, while H C and BH MAX monotonically decrease with the FeCo film thickness. In FeCo cluster/Fe Pt film laminated hybrids, M S , H C and BH MAX increase with the FeCo cluster layer thickness in comparison with those of simple FePt films. However, the remarkable improvement of their hard magnetic properties cannot be attained in these laminated hybrids owing to both the low packing density of FeCo clusters and the difficulty in the diffusion-control of Fe and Co atoms from FeCo to FePt layers.

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Section: Discussionmentioning

confidence: 99%

Section: )mentioning

confidence: 99%

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

et al. 2012

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“…Experimental realizations may be based on high-anisotropy FePt nanocomposite films, similar to those reviewed by Sellmyer et al [19]. Depending on film thickness and exchange, the magnetization in the clusters switches or remains unaffected during domain-wall motion, as illustrated in Fig.…”

Section: Discussionmentioning

confidence: 99%

Continuous/Cluster-Pinned Recording Media

Skomski

Sellmyer

2007

IEEE Trans. Magn.

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We propose and theoretically investigate a new class of nanostructured magnetic recording films, cluster-pinned recording media. The films consist of magnetic clusters exchange coupled to a continuous hard layer with perpendicular anisotropy and low coercivity. Our calculations yield the coercivity and the cross-track correlation length as a function of film thickness and pinning density and strength. The mechanism is very similar to the Gaunt-Friedel pinning in bulk magnets, which differs from ordinary strong pinning by the selfconsistent dependence of wall curvature and coercivity on defect concentration. The main difference is the exponent for the coercivity as a function of the pinning strength, which is equal to 2 in the bulk but equal to 3/2 in thin films. The pinning strength is estimated for various regimes, and it is shown that the diminished domain-wall curvature reduces jitter.

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“…The magnetocrystalline anisotropy field was calculated as Ha = 2 K/Ms. [10] The values of Ha for y = 0, 4, and 6 are 32.8, 39.5, and 45 kOe, respectively. Si addition increases the magnetocrystalline anisotropy field, leading to an enhancement of coercivity from 2.6 kOe for y = 0 to 4.1 kOe for y = 4 (see fig.…”

Section: Experimental Methodsmentioning

confidence: 97%

Magnetic hardening of Zr2Co11:(Ti, Si) nanomaterials

Zhang

Valloppilly

et al. 2014

Journal of Alloys and Compounds

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The role of Ti and Si additions in the magnetic hardening of rapidly quenched Zr2Co11-based nanomaterials has been investigated. Nanocrystalline Zr17-xTixCo83 and Zr18Co82-ySiy are mainly composed of rhombohedral Zr2Co11 and a small amount of orthorhombic Zr2Co11, hcp Co, and cubic Zr6Co23. Ti addition decreases the mean grain size of the magnetic phases, and thus increases coercivity and energy product from 1.6 kOe and 1.9 MGOe for x = 0 to 2.6 kOe and 3.9 MGOe for x = 2, respectively. Si addition enhances the anisotropy field of the hard phase which increases the coercivity but slightly decreases the magnetization. This work shows that Ti has a positive effect on energy product through refinement of structure.

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Assembly of high-anisotropy L10 FePt nanocomposite films

Cited by 27 publications

References 29 publications

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

Continuous/Cluster-Pinned Recording Media

Magnetic hardening of Zr2Co11:(Ti, Si) nanomaterials

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Assembly of high-anisotropy L10 FePt nanocomposite films

Cited by 27 publications

References 29 publications

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe&ndash;Pt and Fe&ndash;Co Alloys

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe&ndash;Pt and Fe&ndash;Co Alloys

Continuous/Cluster-Pinned Recording Media

Magnetic hardening of Zr2Co11:(Ti, Si) nanomaterials

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Product

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Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys

Magnetic Properties of Cluster/Thin-Film Laminated Hybrids of Fe–Pt and Fe–Co Alloys