X-ray absorption and magnetic circular dichroism characterization of a novel ferromagnetic MnNx phase in Mn/Si3N4 multilayers

Céspedes, E.; Huttel, Y.; Martínez, L.; de Andrés, A.; Chaboy, J.; Vila, M.; Telling, N. D.; van der Laan, G.; Prieto, C.
December 2008
Applied Physics Letters;12/22/2008, Vol. 93 Issue 25, p252506
Academic Journal
Ferromagnetism above room temperature has been observed in Mn/Si3N4 multilayered films for the first time. Characterization of the structural and electronic properties was performed to study the ferromagnetic behavior of this system. X-ray absorption spectroscopy at the Mn K and L edges, as well as x-ray magnetic circular dichroism, evidences the presence of divalent Mn in the films. X-ray absorption near edge structure measurements, which are compared to calculations, confirms the presence of a slightly distorted Mn3N2 phase that is proposed to be the origin of the ferromagnetism in this system.


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