Chemically synthesized FePt nanoparticle material for ultrahigh-density recording

Kodama, Hiroyoshi; Momose, Satoru; Sugimoto, T.; Uzumaki, Takuya; Tanaka, Atsushi

doi:10.1109/tmag.2004.838050

Cited by 22 publications

(15 citation statements)

References 8 publications

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“…Furthermore, the magnetic direction of the FePt particles in an assembly tends to be 3D randomly orientated. [120,121] Recent analytical and computational models predict that it is possible to obtain a chemically ordered fct structure in a FePt nanoparticle with a size larger than 3 nm, [122,123] and to align such nanoparticles in a modest magnetic field. [124] Experiments on thermally annealed silica-coated [125] and physically deposited [126] FePt nanoparticles show that single FePt nanoparticles are indeed ferromagnetic and can be partially aligned in a magnetic field, [125] unless the FePt nanoparticles are too small (smaller than 2 nm).…”

Section: Discussionmentioning

confidence: 99%

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

2006

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This paper reviews recent advances in chemical synthesis, self‐assembly, and potential applications of monodisperse binary FePt nanoparticles. After a brief introduction to nanomagnetism and conventional processes of fabricating FePt nanoparticles, the paper focuses on recent developments in solution‐phase syntheses of monodisperse FePt nanoparticles and their self‐assembly into nanoparticle superlattices. The paper further outlines the surface, structural, and magnetic properties of the FePt nanoparticles and gives examples of three potential applications in data storage, permanent magnetic nanocomposites, and biomedicine.

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Section: Discussionmentioning

confidence: 99%

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

2006

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“…Heat treatment is necessary to convert the fcc structure to the ordered face centered tetragonal (fct) structure (L1 0 phase). The high temperature treatments have been observed to lead to the coalescence and agglomeration of NPs resulting in suppressing the recording density evolution (Zeng et al 2002a, b;Kodama et al 2005). The direct synthesis of Fe-Pt NPs in ordered fct structure (L1 0 phase) is highly desirable to avoid high temperature treatment.…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted chemical reduction routes for direct synthesis of Fe–Pt nanoparticles in ordered face centered tetragonal L10 phase

Acharya

Singh

2011

Appl Nanosci

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In the present work, microwave-assisted chemical reduction route has been explored for the direct synthesis of face centered tetragonal (fct) L1 0 phase of Fe-Pt nanoparticles. Effects of microwave power and irradiation time on the growth process were investigated. Using this facile and high yield technique we could tune particle size from 7 to 17 nm. The as-prepared Fe-Pt NPs were observed in ordered fct L1 0 phase without any postsynthesis treatment. The particle size and magnetic properties of the as-prepared Fe-Pt were found to be very sensitive to the microwave irradiation power, while influence of exposure time was insignificant. The hysteresis measurements were performed at room temperature (300 K) to study magnetic properties of as-synthesized Fe-Pt as a function of crystallite size. All specimens of Fe-Pt were found to exhibit ferromagnetic behavior at room temperature. Coercivity and saturation magnetization were observed to be decreasing with diminishing particle size. The microwave-assisted route is found to be a simple technique for direct synthesis of metal alloys and may prove to be a potential tool of high density data storage materials such as Fe-Pt.

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“…As one of the most popular metal-type nanoparticles, Gold nanoparticle provides a promising platform for biological applications in the past years [1]. FePt is another potential magnetic nanoparticles that has attracted interests recently because the resulting materials have uniform particle size, high saturation magnetization and high chemical stability [2]- [4]. These unique characteristics address several potential applications on life science from analysis to therapy.…”

Section: Introductionmentioning

confidence: 99%

Observation of Effective Permittivity of Water-Dispersible FePt Nanoparticles at Microwave Frequencies

et al. 2007

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The 2-4 nm FePt nanoparticles were synthesized by chemical reduction and dispersed into the aqueous solution after the surface modification. The dielectric spectra were measured by an open-ended transmission line technique. An open-ended coaxial cable line was designed to transmit the microwave signals into nanoparticle-filled solutions. The reflection signal revealed the dielectric properties of hydrophobic-coated FePt-filled solution was received by the transmission line. The analysis showed that the effective permittivity was around 70 and down to 50 by the external magnetic field. The flexibility of nanoparticles' permittivity revealed in this study implicates their potential applications ranged from in microwave and millimeter-wave components to biomedical drug delivery system and positron emission tomography scan.

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Chemically synthesized FePt nanoparticle material for ultrahigh-density recording

Cited by 22 publications

References 8 publications

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

Recent Advances in Chemical Synthesis, Self‐Assembly, and Applications of FePt Nanoparticles

Microwave-assisted chemical reduction routes for direct synthesis of Fe–Pt nanoparticles in ordered face centered tetragonal L10 phase

Observation of Effective Permittivity of Water-Dispersible FePt Nanoparticles at Microwave Frequencies

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