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Observation of ferromagnetism in PdCo alloy nanoparticles encapsulated in carbon nanotubes
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View: Figures


Image of FIG. 1.
FIG. 1.

(a) Composition of 16 TEM micrographs of approximately producing an overview of the distribution of several CNTs, which all have encapsulated PdCo nanoparticles. (b) High resolution TEM of a single drop-shaped PdCo nanoparticle. The nanoparticles are composed of a spherical core followed by a conical tail. (c) Electron diffraction pattern (taken at the center of the particle) aligned along the [301] zone axis identifying a structure close to palladium fcc. (d) EDS spectrum of three different regions of the particle, showing the signal from Pd and Co. The signal for Cu and C is from the transmission grating.

Image of FIG. 2.
FIG. 2.

Magnetization as a function of magnetic field for PdCo nanoparticles is noticeable as the slight difference in lineshape for fields applied perpendicular and parallel to the CNT axis. A small hysteresis of ≈100 Oe is also observed. The inset shows the second derivative of the parallel magnetization, from which a saturation field of ≈1500 Oe was inferred.

Image of FIG. 3.
FIG. 3.

Normalized x-ray absorption spectra at the edges of cobalt (a) and palladium (b) of PdCo nanoparticles in CNTs. In all spectra a linear background was subtracted. At the bottom the difference curves normalized by the degree of circular polarization are shown, from which the magnetization of both atoms was determined.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Observation of ferromagnetism in PdCo alloy nanoparticles encapsulated in carbon nanotubes