Carolin Schmitz-Antoniak Characterisation of FePt nanomagnets by X-ray absorption spectroscopy physica status solidi (a) 210
X-ray absorption spectroscopy is presented as a powerful tool to characterise nanoscale systems regarding their structural and magnetic properties. In particular, the extended X-ray absorption fine structure has been employed and analysed by standard Fourier based analysis and using wavelet transforms. The latter can be used to directly visualise contributions to the fine structure from different atomic species in the local environment of the absorbing atoms with a high resolution in both real space and reciprocal space. In addition, spin and orbital magnetic moments have been determined by X-ray magnetic circular dichroism to investigate the local structure around Fe and Pt atoms and of the two atomic species, respectively. The detailed atomistic picture deduced from experimental results on FePt nanoparticles was compared to recent calculations within the density functional theory that gave the possibility to state design rules for the preparation of nanoparticles with desired magnetic properties. In this review, a short survey about these findings is given focusing on the experimental work.
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