Determination of the Néel vector in rutile altermagnets through x-ray magnetic circular dichroism: the case of MnF${}_2$

Abstract

We present a numerical simulation of the X-ray magnetic circular dichroism (XMCD) at the $L_{2,3}$ edge of Mn in altermagnetic MnF${}_2$ using a combination of density functional + exact diagonlization of an atomic model. We explore how the dichroic spectra vary with the light propagation vector and the Néel vector. We show how XMCD in rutile structures can be employed to determine the orientation of the Néel vector. An exact relationship between the XMCD spectra for different orientation of the Néel vector valid in the absence on the valence spin-orbit coupling and core-valence multipole interaction is derived and its approximate validity demonstrated by numerical calculation for the full Hamiltonian.

12 pages, 9 figures. arXiv admin note: text overlap with arXiv:2312.02629

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• Altermagnetic variants in thin films of Mn5Si3
• Circular Dichroism in Resonant Inelastic X-ray Scattering: Probing Altermagnetic Domains in MnTe
• Systematic Mapping of Altermagnetic Magnons by Resonant Inelastic X-Ray Circular Dichroism
• Magnetic Dichroism in Rutile NiF${}_2$: Separating Altermagnetic and Ferromagnetic Effects
• Spin-resolved quasiparticle interference patterns on altermagnets via non-spin-resolved scanning tunneling microscopy
• On the Néel Vector Dependence of X-ray Magnetic Circular Dichroism in Altermagnets
• Analysis of Spin Current Generation by Elastic Waves in $f$-wave Altermagnets