X-ray Magnetic Circular Dichroism in RuO${}_2$

Abstract

We present numerical simulation of the X-ray magnetic circular dichroism (XMCD) of the $L_{2,3}$ and $M_{2,3}$ edges of Ru in antiferromagnetic RuO${}_2$ using a combination of density functional + dynamical mean-field theory and configuration interaction treatment of Anderson impurity model. We study the dependence of the dichroic spectra on the orientation of the Néel vector and discuss it in the context of altermagnetism. Approximate equivalence between the XMCD spectra for geometries with X-rays propagating parallel and perpendicular to the Néel vector is found and shown to be exact in absence of valence spin-orbit coupling and core-valence multipolar interaction.

arXiv comment7 pages, 6 figures

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• Spin-Splitting Magnetoresistance in Altermagnetic RuO2 Thin Films
• Determination of the Néel vector in rutile altermagnets through x-ray magnetic circular dichroism: the case of MnF${}_2$
• Magneto-optical spectra of an organic antiferromagnet as a candidate for an altermagnet
• Magnetic Dichroism in Rutile NiF${}_2$: Separating Altermagnetic and Ferromagnetic Effects
• On the Néel Vector Dependence of X-ray Magnetic Circular Dichroism in Altermagnets
• Time reversal reserved spin valve and spin transistor based on unconventional $p$-wave magnets