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(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  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.
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.
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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