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²©Ê¿ÂÛÎÄMagnetic Nanoparticles, A Study by Synchrotron Radiation and RF Transverse Susceptibility Doctoral Thesis accepted by the University of Zaragoza, Spain Ô¸¶ÔÓÃͬ²½·øÉästudyÄÉÃ×´ÅÐÔµÄͬÐÐÓаïÖú Magnetic nanoparticles (NPs) are finding their place in many modern technologies such as electronics (memory or spintronic devices) and also in medicine (contrast media, electromagnetic thermal therapy) to name some cases. The application of modern techniques based on synchrotron radiation, X-ray absorption spectroscopy (XAS), extended X-ray absorption fine structure (EXAFS), and X-ray magnetic circular dichroism (XMCD) have allowed Dr. Figueroa to understand the forma- tion of multigranular Co¨CM alloyed NPs, embedded in an amorphous alumina matrix. The Co¨CW alloyed NPs constitute a paradigmatic class since the particles show anisotropy in spite of their amorphous character. On the other hand, Co¨CPt NPs exhibit perpendicular anisotropy and interesting new magnetic phases. Besides, magnetite NPs coated with oleic acid show excellent human compatibility while preserving the bulk magnetic figures of merit. By means of an RF transverse susceptibility probe, built ad hoc, the intrinsic and extrinsic contributions to the anisotropy could be disentangled. Gold nanoparticles deposited on a biological template, prepared from Sulfolobus acidocaldarius S-layer, were shown to possess intrinsic magnetism caused by the electron exchange with the Sulfur atoms provided by the template. Both macroscopic and microscopic properties of several classes of NPs, hitherto unexplained, have been revealed for the first time. Zaragoza, May 2014 Prof. Juan Bartolom¨¦ Sanjoaqu¨ªn Dr. Luis Miguel Garc¨ªa Vinuesa |
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