Effect of Additives on the Direct Synthesis of L10-FePt Nanoparticles by Polyol Process

Hisano, S.; Sato, Kimitaka; Urakawa, Kiyoshi; Jeyadevan, B.; Tohji, Kazuyuki

doi:10.3379/jmsjmag.29.814

Cited by 7 publications

(3 citation statements)

References 10 publications

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“…The FePt nanoparticles have been prepared by using the modified polyol process as reported elsewhere [2]. Predetermined amounts of iron-and platinum-acetylacetonate were dissolved in tetraethylene glycol (TEG).…”

Section: Synthesis Of Fept Nanoparticlesmentioning

confidence: 99%

“…The direct synthesis of partially ordered FePt particles by using polyol process has been reported [1,2]. Though the formation of partially ordered structure was claimed to be due to the consequence of mild reaction conditions, no detailed study on the formation process or structural information on the product obtained using polyol process was reported to date.…”

Section: Introductionmentioning

confidence: 97%

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Local structural studies of directly synthesized L10 FePt nanoparticles by using XRD, XAS and ASAXS

Shinoda

Sato²,

Jeyadevan

et al. 2007

Journal of Magnetism and Magnetic Materials

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Section: Synthesis Of Fept Nanoparticlesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Local structural studies of directly synthesized L10 FePt nanoparticles by using XRD, XAS and ASAXS

Shinoda

Sato²,

Jeyadevan

et al. 2007

Journal of Magnetism and Magnetic Materials

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“…6 kOe and more than 40 kOe, respectively as shown in Fig. 1 [2]. The possible mechanism for partial ordering will be discussed based on the X-ray absorption fine structure analysis of the FePt particles synthesized at 473 and 573 K [3].…”

mentioning

confidence: 99%

Polyol Process for Fe-based Hard (FCT-FePt) and Soft (FeCo) Nanoparticles

Jeyadevan

Shinoda

Sato³

et al. 2006

INTERMAG 2006 - IEEE International Magnetics Conference

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The synthesis of magnetic as well as non-magnetic nanoparticles is of fundamental importance for the development of novel technologies based on the properties of the particle itself or nanostructures using the same. Since most of the novel applications demands the use of either metal or alloy magnetic particles, synthesis of the same by using non-aqueous process is preferred. In this paper, we report the synthesis of Fe-based hard (fct-FePt) and soft (FeCo) magnetic materials using modified polyol process. Fe-Pt nanoparticles: Equiatomic FePt nanoparticles with the ordered L1 0 structure is attractive as high-density magnetic recording media. In our recent work, chemically synthesized fcc-FePt nanoparticles with narrow size distribution and their self-assembled array with close-packed microstructure has been achieved successfully. However, the particles coalesced during the subsequent annealing step which is necessary to obtain L1 0 FePt nanoparticles. Later, the authors successfully demonstrated the direct synthesis of L1 0 FePt nanoparticles at low temperatures of 553 K using "modified polyol method" without subsequent annealing, whose diameter is 5-10 nm and intrinsic magnetocrystalline anisotropy field (H k ) of 31 kOe[1]. Partially ordered L1 0 -FePt nanoparticles synthesized in tetraethylene glycol by using polyol process is mostly polycrystalline in nature. Thus attempts were made to prepare single crystal L1 0 -FePt nanoparticles by introducing nucleating and complex agents during the synthesis. Though the fluxuation in physical properties of L1 0 -FePt particles was minimized using hexachloroplatinate (H 2 PtCl 6 ) as the nucleating agent, particles remained polycrystalline in nature. However when carboxylic acid was used along with H 2 PtCl 6 , FePt nanoparticles with more than 50 % ordering was realized under the optimum experimental conditions of Fe:Pt initial mole ratio of 52.5:47.5, 1 at. % of Pt as H 2 PtCl 6 and carboxylic acid, five equivalent weight of Fe. The superlattice reflection lines of (001) and (110) in XRD pattern and the sextets from the Mossbauer spectroscopy at room temperature confirmed the presence of L1 0 phase as shown in Fig 1. The coercivity and anisotropy field of these particles were 5. 6 kOe and more than 40 kOe, respectively as shown in Fig.

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