Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 60: Focus Session: Unoccupied States by Inverse Photoemission I
O 60.6: Talk
Wednesday, March 11, 2026, 12:00–12:15, WILL/A317
Combining Spin Polarized Inverse Photoemission Spectroscopy with Angle-resolved X-ray Magnetic Circular Dichroism — •Takashi Komesu1, Arjun Subedi1, Bharat Giri1, Ather Mahmood1, Will Echtenkamp1, Mike Street1, Alpha N’Diaye2, Xiaoshan Xu1, Christian Binek1, and Peter Dowben1 — 1University of Nebraska-Lincoln, Lincoln, NE, U.S.A — 2Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, U.S.A
While angle-resolved magnetometry and angle-resolved X-ray Magnetic Circular dichroism (XMCD) might provide hints of spin or moment canting at a surface, even XMCD taken in the total electron yield (TEY) mode cannot convincingly implicate the surface. Spin Polarized Inverse Photoemission Spectroscopy (SPIPES) is hugely surface sensitive, which is an advantage for characterizing boundary polarization of materials. With in-plane SPIPES, we have convincing proof of deviation from the expected perpendicular anisotropy for boron (B) doped Cr2O3(0001) and at the surface of NiCo2O4(001). For NiCo2O4(001), the Ni magnetic moments are canted slightly off the surface normal, as evident in elemental specific angle-resolved XMCD and consistent with the very surface sensitive SPIPES. In this presentation, we will show the great value of combining SPIPES with XMCD and magnetometry. Furthermore, we can provide an example where an exponential decay of spin polarization is not evidence of a finite paramagnetic correlation length, as in the case of thickness dependent Pd over layers on Cr2O3(0001), where Pd is no longer paramagnetic.
Keywords: spin polarized inverse photoemission spectroscopy; angle-resolved X-ray Magnetic Circular Dichroism; surface magnetism