A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Bayesian spectroscopy of synthesized soft X-ray absorption spectra showing magnetic circular dichroism at the Ni-L3, -L2 edges
We proposed a data-driven science study by Bayesian spectroscopy to analyze an X-ray magnetic circular dichroism (XMCD) spectrum and magnetic moments. In Bayesian spectroscopy, model selection becomes available to estimate the number of spectral components by using Bayes free energy. To demonstrate such advantage, we decomposed synthesized X-ray absorption (XA) and XMCD spectra at the $${L_{3,2}}$$-absorption edge of the Ni ion in NiFe$$_2$$O$$_4$$. In the synthesized $$ \mp $$helicity XA spectra, random noise was superimposed and a finite spectral width was convolved to mimic measured spectra. From these XA spectra, spectral components having intensity beyond the noise level were successfully extracted without excess or deficiency although transition components in close proximity within the spectral width were merged. From the XMCD spectrum, we also succeeded in extracting separately the original $$ \mp $$helicity components although an additional $$ - $$helicity component comparing with the case of XA spectra was extracted in the model selection. This additional component was extracted to explain an asymmetric XMCD spectral structure at the $${L_3}$$ edge, and this result demonstrates that Bayesian spectroscopy can fully exploit the advantage of XMCD measurements being superior for detecting close transition components of opposite helicities. In addition, we proposed to use posterior probability distributions obtained by Bayesian spectroscopy for estimating magnetic moments through samplings of the spectral intensities for the separately decomposed $$ \mp $$helicity components on the $${L_{3,2}}$$-absorption edge.
Bayesian spectroscopy of synthesized soft X-ray absorption spectra showing magnetic circular dichroism at the Ni-L3, -L2 edges
We proposed a data-driven science study by Bayesian spectroscopy to analyze an X-ray magnetic circular dichroism (XMCD) spectrum and magnetic moments. In Bayesian spectroscopy, model selection becomes available to estimate the number of spectral components by using Bayes free energy. To demonstrate such advantage, we decomposed synthesized X-ray absorption (XA) and XMCD spectra at the $${L_{3,2}}$$-absorption edge of the Ni ion in NiFe$$_2$$O$$_4$$. In the synthesized $$ \mp $$helicity XA spectra, random noise was superimposed and a finite spectral width was convolved to mimic measured spectra. From these XA spectra, spectral components having intensity beyond the noise level were successfully extracted without excess or deficiency although transition components in close proximity within the spectral width were merged. From the XMCD spectrum, we also succeeded in extracting separately the original $$ \mp $$helicity components although an additional $$ - $$helicity component comparing with the case of XA spectra was extracted in the model selection. This additional component was extracted to explain an asymmetric XMCD spectral structure at the $${L_3}$$ edge, and this result demonstrates that Bayesian spectroscopy can fully exploit the advantage of XMCD measurements being superior for detecting close transition components of opposite helicities. In addition, we proposed to use posterior probability distributions obtained by Bayesian spectroscopy for estimating magnetic moments through samplings of the spectral intensities for the separately decomposed $$ \mp $$helicity components on the $${L_{3,2}}$$-absorption edge.
Bayesian spectroscopy of synthesized soft X-ray absorption spectra showing magnetic circular dichroism at the Ni-L3, -L2 edges
Taiga Yamasaki (author) / Kazunori Iwamitsu (author) / Hiroyuki Kumazoe (author) / Masato Okada (author) / Masaichiro Mizumaki (author) / Ichiro Akai (author)
2021
Article (Journal)
Electronic Resource
Unknown
Metadata by DOAJ is licensed under CC BY-SA 1.0
Magnetic Circular Dichroism in the Soft X-Ray Absorption Spectra of Co-Based Heusler Alloys
| British Library Online Contents | 2002
X-Ray Magnetic Circular Dichroism Spectroscopy and Microscopy
| British Library Online Contents | 1995
Magnetic properties of multilayers from soft X-ray magnetic circular dichroism
| British Library Online Contents | 1995
X-ray magnetic circular dichroism in quasicrystals
| British Library Online Contents | 2000
Angle-Resolved Photoemission Spectroscopy and Magnetic Circular Dichroism in Fe-Intercalated TiS~2
| British Library Online Contents | 2002