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X-ray magnetic circular dichroism and near-edge X-ray absorption fine structure of buried interfacial magnetism measured by using a scanning tunneling microscope tip

Authors :
Hao Chang
Yuan Zhang
Saw-Wai Hla
Anand Bhattacharya
Volker Rose
Daniel Rosenmann
John W. Freeland
Jason Hoffman
Nozomi Shirato
Source :
Applied Physics Letters. 113:061602
Publication Year :
2018
Publisher :
AIP Publishing, 2018.

Abstract

Magnetism at buried interfaces plays a crucial role in many emerging phenomena, but detection of interfacial magnetism in close proximity to a surface with elemental and chemical sensitivity is a challenging task. Here, we use low temperature synchrotron x-ray scanning tunneling microscopy to investigate x-ray magnetic circular dichroism and the near edge x-ray absorption fine structure of La0.67Sr0.33MnO3-LaNiO3 superlattices. In stark contrast to the weak magnetic signal of Mn when the La0.67Sr0.33MnO3 layers are located on top, a robust x-ray magnetic circular dichroism signal is detected when they are buried underneath the LaNiO3 layers. The near edge x-ray absorption fine structure reveals the valence states of manganese, while the oxygen K-edge x-ray absorption spectra show an increase in hole formation, indicating a cogent charge transfer at the LaNiO3/La0.67Sr0.33MnO3 interface. This work demonstrates that scanning tunneling microscopy can be extended to the synchrotron X-ray study of buried interfaces by controlling the tip-sample separation in the nanometer regime.

Details

ISSN :
10773118 and 00036951
Volume :
113
Database :
OpenAIRE
Journal :
Applied Physics Letters
Accession number :
edsair.doi...........3cf598d0a849990478c8f25a1e17ddb4
Full Text :
https://doi.org/10.1063/1.5031877