Control of the asymmetric band structure in Mn2Au by a ferromagnetic driver layer

• DOI: 10.1103/physrevb.108.104413
• Publication Date: 2023-09-15T14:01:37Z
• Authors: Y. Lytvynenko; O. Fedchenko; S. V. Chernov; S. Babenkov; D. Vasilyev; O. Tkach; A. Gloskovskii; T. R. F. Peixoto; C. Schlueter; V. Grigorev; M. Filianina; S. Sobolev; A. Kleibert; M. Kläui; J. Demsar; G. Schönhense; M. Jourdan; H. J. Elmers
• Keywords: Permalloy

Hard x-ray angle-resolved photoemission spectroscopy reveals the momentum-resolved band structure in an epitaxial ${\mathrm{Mn}}_{2}\mathrm{Au}$(001) film capped by a 2-nm-thick ferromagnetic permalloy layer. By magnetizing capping layer, exceptionally strong exchange bias aligns N\'eel vector accordingly. Uncompensated interface Mn magnetic moments ${\mathrm{Mn}}_{2}\mathrm{Au}$ were identified as origin of using circular dichroism combination with photoelectron emission microscopy. Using time-of-flight momentum microscopy, we measure asymmetry structure, $E(k)\ensuremath{\ne}E(\ensuremath{-}k)$, resulting from homogeneous orientation vector. Comparison theory shows that vector, determined moment top is antiparallel to magnetization. The experimental results demonstrate hard can layers beneath metallic layer and corroborate asymmetric was previously inferred only indirectly.