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Influence of excess Fe accumulation over the surface of FePt nanoparticles: Structural and magnetic properties
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10.1063/1.4796091
/content/aip/journal/jap/113/13/10.1063/1.4796091
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/13/10.1063/1.4796091
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

XRD patterns of (a) as-synthesized and (b) annealed FePt nanoparticles at 600 °C for 1 h along with JCPDS #-29-0717 (fcc-FePt) andJCPDS #-43-1359 (fct-FePt) data file. (c) Williamson-Hall Plot for as-synthesized one.

Image of FIG. 2.
FIG. 2.

FTIR spectrum of as-synthesized FePt nanoparticles coated with oleic acid and oleylamine.

Image of FIG. 3.
FIG. 3.

(a) TEM image of as-synthesized fcc-FePt nanoparticles and (b) its HRTEM image showing lattice fringes.

Image of FIG. 4.
FIG. 4.

(a) TEM image of annealed (at 600 °C) fct-FePt nanoparticles, and (b) its HRTEM image showing lattice fringes.

Image of FIG. 5.
FIG. 5.

XPS spectra of as-synthesized FePt nanoparticle coated with oleic acid and oleylamine: (a) C 1 s, (b) O 1 s, (c) Fe 2 p, and (d) Pt 4f recorded at room temperature.

Image of FIG. 6.
FIG. 6.

M vs H plots of the as-synthesized FePt nanoparticles: (a) M-H at 5, 50, 100, and 300 K with inset: expanded form of M-H at 300 K and (b) M-H at 5 K with insets: (i) its expanded view and (ii) variation of coercivity with temperature.

Image of FIG. 7.
FIG. 7.

ZFC and FC curves for as-synthesized FePt nanoparticles at (a) different applied fields of 50, 100, 500, 1000 and 1 × 104 Oe and (b)50 Oe in expanded scale for clarity.

Image of FIG. 8.
FIG. 8.

The real (a) and imaginary (b) parts of ac susceptibility for as-synthesized FePt nanoparticles measured at different ac frequencies and fixed amplitude of 4 Oe with no dc bias field. Inset: expanded form of the real part.

Image of FIG. 9.
FIG. 9.

(a) Néel–Arrhenius model and (b) Vogel–Fulcher model fitting to the blocking temperatures obtained from the χ′ dataset peaks of as-synthesized sample.

Image of FIG. 10.
FIG. 10.

The real (a) and imaginary (b) parts of ac susceptibility for FePt nanoparticles measured at varied dc bias fields and fixed ac field (amplitude = 4 Oe and frequency = 10 Hz). Arrow denotes the trend in positions of TB .

Image of FIG. 11.
FIG. 11.

Hysteresis plot for the annealed sample: M-H at 5, 50, 100, and 300 K. Inset showing the expanded form with arrows indicating the kink.

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/content/aip/journal/jap/113/13/10.1063/1.4796091
2013-04-02
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Influence of excess Fe accumulation over the surface of FePt nanoparticles: Structural and magnetic properties
http://aip.metastore.ingenta.com/content/aip/journal/jap/113/13/10.1063/1.4796091
10.1063/1.4796091
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