TY  - JOUR
AU  - Lytvynenko, Y.
AU  - Akashdeep, A.
AU  - Vo, T. P.
AU  - Tkach, O.
AU  - Chernov, S. V.
AU  - Gloskovskii, A.
AU  - Schlueter, C.
AU  - Luo, C.
AU  - Ukleev, V.
AU  - Radu, F.
AU  - Kronast, F.
AU  - Hiroto, T.
AU  - Winkelmann, A.
AU  - Minár, J.
AU  - Kläui, M.
AU  - Schoenhense, Gerd
AU  - Jakob, G.
AU  - Elmers, Hans-Joachim
AU  - Fedchenko, O.
TI  - Magnetic circular dichroism in core-level x-ray photoelectron spectroscopy of altermagnetic RuO<sub>2</sub> films
JO  - Physical review / B
VL  - 113
IS  - 1
SN  - 2469-9950
CY  - Woodbury, NY
PB  - Inst.
M1  - PUBDB-2026-00367
SP  - 014403
PY  - 2026
AB  - 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. 
LB  - PUB:(DE-HGF)16
DO  - DOI:10.1103/x2h4-rtky
UR  - https://bib-pubdb1.desy.de/record/644508
ER  -