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

Chang, H.; Shirato, N.; Zhang, Y.; Hoffman, J.; Rosenmann, D.; Freeland, J. W.; Bhattacharya, A.; Rose, V.; Hla, S. -W.

doi:10.1063/1.5031877

Title: 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

Journal Article · Mon Aug 06 00:00:00 EDT 2018 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.5031877· OSTI ID:1465772

Chang, H. ^[1]; Shirato, N. ^[2]; Zhang, Y. ^[2]; Hoffman, J. ^[3]; Rosenmann, D. ^[2];

^[2];

^[2]; Rose, V. ^[2];

^[4]

Argonne National Lab. (ANL), Argonne, IL (United States); Ohio Univ., Athens, OH (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Harvard Univ., Cambridge, MA (United States)
Ohio Univ., Athens, OH (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

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 a low temperature synchrotron x-ray scanning tunneling microscopy to investigate x-ray magnetic circular dichroism and near edge x-ray absorption fine structure of La_0.67Sr_0.33MnO₃-LaNiO₃ superlattices in the absence of a magnetic field. In stark contrast to the weak magnetic signal of Mn when the La_0.67Sr_0.33MnO₃ 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 the manganese while the oxygen K- edge x-ray absorption spectra show an increase in hole formation indicating a cogent charge transfer at the LaNiO₃/La_0.67Sr_0.33MnO₃ interface. This work demonstrates that scanning tunneling microscopy can be extended to the synchrotron X-ray study of buried interfaces by controlling the sample-tip (e.g., detector) separation in the nanometer regime. The close sample-tip proximity further provides a path toward probing of small lateral areas with zero-field measurements in multi-domain samples.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE

Grant/Contract Number:: AC02-06CH11357; SC70705; FG02-02ER46012

OSTI ID:: 1465772

Alternate ID(s):: OSTI ID: 1463221

Journal Information:: Applied Physics Letters, Vol. 113, Issue 6; ISSN 0003-6951

Publisher:: American Institute of Physics (AIP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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Title: 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

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