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| Hauptseite > Publikationsdatenbank > Competing spin-orbit coupling and exchange interaction in a two-dimensional ferromagnet |
| Hauptseite > Publikationsdatenbank > Competing spin-orbit coupling and exchange interaction in a two-dimensional ferromagnet |
| Book/Dissertation / PhD Thesis | FZJ-2026-03618 |
2026
Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
Jülich
ISBN: 978-3-95806-939-8
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Please use a persistent id in citations: doi:10.34734/FZJ-2026-03618
Abstract: The interplay between exchange interaction and spin-orbit coupling (SOC) in lowdimensional ferromagnetic systems plays a pivotal role in shaping their electronic and spin properties, with direct implications for spintronic applications. This thesisinvestigates the electronic structure of ultrathin epitaxial FePd alloy on Pd(001) using spin- and momentum-resolving photoemission spectroscopy, focusing on symmetry breaking and SOC-driven band hybridization. A systematic approach using synchrotron-based spin-resolving photoelectron momentum microscopy is employed to explore these phenomena. The study begins with an analysis of SOC effects in bulk Pd, followed by exchange engineering in ultrathin FePd alloys, and culminates in the investigation of their combined effects. Fermi surface tomography reveals that SOC strongly influences the electronic band structure of Pd, leading to band splitting, hole pocket formation, and a modified Fermi surface topology. In the FePd alloy, exchange interaction induces a two-dimensional half-metallic band structure that is tunable via the alloy stoichiometry. The interplay between exchange interaction and SOC is further examined by varying the magnetization direction, demonstrating magnetization-induced asymmetries in the band structure and indications of non-collinear spin textures across the Fermi surface. A key finding of this thesis is the emergence of two-dimensional half-metallicity in two monolayers of FePd alloy on Pd(001), which has direct implications for spinfiltering heterostructures in electronic devices. Additionally, spin-mixing hotspots appear near the band-crossing points where SOC lifts band degeneracies and alters the topology of spin-polarized bands. These features are experimentally resolved and corroborated by first-principles calculations. The ability to control these effects by tuning the magnetization and the alloy composition suggests potential applications in spintronic devices, including spin filters and spin-orbit torque platforms. This work highlights the versatility of momentum microscopy in resolving spindependent electronic structures in hybrid ferromagnetic systems. The findings provide fundamental insights into the role of exchange interaction and SOC in low-dimensional materials, establishing two monolayers of FePd alloy on Pd(001) as a model system for exploring complex spin textures, topological transport phenomena, and engineered spintronic functionalities.
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