Investigation of Prussian Blue Analogs by XMCD at the K-edge of transition metals

16th International Conference on X-ray Absorption Fine Structure

Bordage, A.^1 ; Nataf, L.^2 ; Baudelet, F.^2 ; Bleuzen, A.^1

ICMMO, Univ. Paris Sud, UMR CNRS 8182, Univ. Paris Saclay, Rue du doyen G. Poitou, Orsay Cedex

91405, France^1

Synchrotron SOLEIL, L'Orme les Merisiers Saint-Aubin, BP48, Gif sur Yvette Cedex

91192, France^2

关键词: Electronic parameters;    Model compound;    Photomagnetic properties;    Prussian blue analogs;    Structural distortions;    Structural information;    Unpaired electrons;    X-ray magnetic circular dichroism;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/712/1/012109/pdf
DOI  :  10.1088/1742-6596/712/1/012109

来源: IOP

【 摘 要 】

Despite transition metal (TM) K-edge x-ray magnetic circular dichroism (XMCD) seems an interesting tool to get magnetic and structural information at the atomic scale, the effects originating this signal are still poorly understood. We thus initiated a deep investigation of the TM K-edge XMCD using Prussian Blue analogs (PBA) as model-compounds. In a recent study of the NiFe PBA family, we demonstrated that the XMCD signals at the TM K-edges strongly vary with external (mechanical) or internal (chemical) pressure and so that they are highly sensitive to small structural distortions. Following these first results, we extended this approach to the MnFe and CoFe families to evaluate the effect of electronic parameters (number of unpaired electrons of the MIITM) on the XMCD signal. All the results set milestones in the disentanglement of the components originating the XMCD signals at the K-edge of TM and will eventually help in a better understanding of the photomagnetic properties of PBAs.