Spectroscopic aspects of the magnetic interaction in SrCoO2.75 and SrCoO3 thin films

The origin of the magnetic interaction in SrCoO2.75 and SrCoO3 thin films has been investigated with the help of their experimental valence band (VB) and the conduction band (CB) at room temperature. The ultraviolet photoemission spectroscopy and the O K-edge X-ray absorption spectroscopy were used to probe the VB and CB of the films respectively. It is found that the negative charge transfer energy (Delta) is contributing to the lowest energy charge fluctuations for the double-exchange ferromagnetic interaction in the systems which is larger in SrCoO2.75 film than SrCoO3 film. The magnetic exchange interactions have been realized from a model derived from the combined VB-CB spectra and the Co L-edge absorption spectra. These results offer a valuable inside into the correlation between the microscopic electronic structure and the macroscopic magnetization in the negative. double-exchange ferromagnetic oxides. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

The research investigates the origin of magnetic interaction in SrCoO2.75 and SrCoO3 thin films by analyzing their experimental valence band (VB) and conduction band (CB). It is found that negative charge transfer energy contributes to the lowest energy charge fluctuations, with a larger effect in SrCoO2.75 film. Magnetic exchange interactions are realized from a model derived from combined VB-CB spectra and Co L-edge absorption spectra, offering valuable insight into the correlation between microscopic electronic structure and macroscopic magnetization in negative double-exchange ferromagnetic oxides.