%0 Journal Article
%A Lytvynenko, Y.
%A Akashdeep, A.
%A Vo, T. P.
%A Tkach, O.
%A Chernov, S. V.
%A Gloskovskii, A.
%A Schlueter, C.
%A Luo, C.
%A Ukleev, V.
%A Radu, F.
%A Kronast, F.
%A Hiroto, T.
%A Winkelmann, A.
%A Minár, J.
%A Kläui, M.
%A Schoenhense, Gerd
%A Jakob, G.
%A Elmers, Hans-Joachim
%A Fedchenko, O.
%T Magnetic circular dichroism in core-level x-ray photoelectron spectroscopy of altermagnetic RuO<sub>2</sub> films
%J Physical review / B
%V 113
%N 1
%@ 2469-9950
%C Woodbury, NY
%I Inst.
%M PUBDB-2026-00367
%P 014403
%D 2026
%X While ferromagnetism and antiferromagnetism are well-established classes of magnetic order, a third class of collinear magnetic order, termed altermagnetism, has recently attracted scientific interest. We measured magnetic circular dichroism (MCD) in core-level photoemission (XPS) at the Ru 2⁢𝑝<sub>3/2</sub> and 2⁢𝑝<sub>1/2</sub> core levels in epitaxial RuO<sub>2</sub>⁢(110)/TiO<sub>2</sub>⁢(110)films using circularly polarized x rays at 6 keV, as well as x-ray magnetic circular dichroism (XMCD) in resonant x-ray absorption at the Ru M<sub>3/2</sub>(3⁢𝑝<sub>3/2</sub> and 3⁢𝑝 <sub>1/2</sub>) edges. Charge transfer multiplet calculations show that the MCD-XPS and the XMCD can be explained by an altermagnetic locking of Ru magnetic moments and a distorted crystal field orientation. The distortion is caused by the epitaxial strain. The collinear magnetic moments in RuO<sub>2</sub>occupy sublattice sites with distorted octahedral crystal fields that are rotated by 90∘with respect to each other. A change in the sign of the MCD-XPS at different sample positions indicates the presence of altermagnetic domains with the size of around hundreds of micrometers.
%F PUB:(DE-HGF)16
%9 Journal Article
%R 10.1103/x2h4-rtky
%U https://bib-pubdb1.desy.de/record/644508