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[×ÊÔ´] ²©Ê¿ÂÛÎÄMagnetic Nanoparticles

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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  • ¸½¼þ 1 : bok%3A978-3-319-07094-0Magnetic_Nanoparticles.pdf
  • 2015-03-08 01:12:29, 7.59 M

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