X-ray absorption spectroscopy is a powerful tool to study novel materials without long-range order. It was applied to research new magnetic semiconducting thin films (GaN:Mn) and nanostructured samples (ZnO:C and AlN:Cu nanorods). Both synchrotron radiation and laboratory X-ray sources were used. Theoretical ab-initio simulations were performed within band structure approach. Electronic structure and distribution of spin magnetic moments around Cu and C dopants were calculated with density functional theory. Advanced analysis of the X-ray absorption near edge structure (XANES) spectra was implemented to extract parameters of the local atomic geometry around the absorbing atom with high degree of accuracy. The X-ray-magnetic circular dichroism (XMCD) study yielded direct information about magnetic moments on the doping atoms and, therefore, facilitated understanding of the origin of ferromagnetic properties of the materials under study. Different ways of ferromagnetic coupling in these materials and a role of the local atomic structure distortions around the doping atoms are discussed.
|Title of host publication||Piezoelectrics and Related Materials|
|Subtitle of host publication||Investigations and Applications|
|Publisher||Nova Science Publishers, Inc.|
|Number of pages||27|
|Publication status||Published - 1 Feb 2012|
ASJC Scopus subject areas
- Materials Science(all)