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Nominated as an outstanding Ph.D. thesis by Universidad de Zaragoza, Spain
Provides both macroscopic and microscopic studies of several magnetic nanoparticle systems including granular multilayer films, biological gold nanoparticles and particles for biomedical applications
Presents a novel design of the RF transverse susceptibility setup used for direct measurements of magnetic anisotropy
Magnetic nanoparticles (NPs) are finding their place in many modern technologies such as electronics (memory or spintronic devices) and medicine (contrast media, electromagnetic thermal therapy) to name just a few examples. The application of modern techniques based on synchrotron radiation, in particular X-ray spectroscopies, as well as an rf transverse susceptibility probe, built ad hoc, allowed the author to investigate several classes of magnetic NPs with diverse applications. For example, the interesting anisotropic properties of CoW and CoPt NPs revealed new magnetic behaviour and phases. Gold NPs prepared on a biological template from Sulfolobus acidocaldarius S-layer, were shown to possess intrinsic magnetism caused by the electron exchange with the sulfur atoms of the template. Silica and oleic acid coated magnetite NPs showed excellent human compatibility while preserving the bulk magnetic figures of merit. Both macroscopic and microscopic properties of all these NPs, hitherto unexplained, have been revealed for the first time.
Content Level »Research
Keywords »Alloy Nanoparticles - Applications of Magnetic Nanoparticles - Biological Nanoparticles - Granular Multilayer Films - Magnetic Nanoparticle Properties - Perpendicular Magnetic Anisotropy - RF Transverse Susceptibility