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Magnetic Properties And Short-Range Structure Analysis Of Granular Cobalt Silicon Nitride Multilayers, Félix Jiménez-Villacorta, A. Espinosa, E. Cespedes, C. Prieto
Magnetic Properties And Short-Range Structure Analysis Of Granular Cobalt Silicon Nitride Multilayers, Félix Jiménez-Villacorta, A. Espinosa, E. Cespedes, C. Prieto
Felix Jiménez-Villacorta
The magnetic properties and local order of cobalt/silicon nitride metal-insulator multilayered system have been studied. Magnetization characterization reveals an evolution of the magnetic features by varying the metal layer thickness. Results show that multilayers with larger metal thickness (t) present a pure ferromagnetic character, whereas samples with t < 2 nm exhibit a granular superparamagnetic behavior, as it corresponds to discontinuous metal-insulator materials. An important decrease in the magnetization values for the clustered samples has also been observed. X-ray absorption near edge spectroscopy (XANES) and extended x-ray absorption fine structure (EXAFS) at the Co K-edge have been used to determine the …