Regensburg 2022 – scientific programme
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MA: Fachverband Magnetismus
MA 30: Surface Magnetism
MA 30.3: Talk
Thursday, September 8, 2022, 10:00–10:15, H48
Spin-resolved Fermi Surface of "Half-Metallic" FePd Alloy Monolayers — •Xin Liang Tan1,2, Kenta Hagiwara1,2, Ying-Jiun Chen1,2, Vitaliy Feyer1, Claus M. Schneider1,2, and Christian Tusche1,2 — 1Forschungszentrum Jülich, Peter Grünberg Institut, Jülich — 2Fakultät für Physik, Universität Duisburg-Essen, Duisburg
Magnetism in reduced dimensions is one of the preconditions for the realization of nanoscale spintronics. Despite the recent discovery of ferromagnetism in monolayers of two-dimensional materials, tunability and engineering on such systems are challenging. Here we present the electronic structure of ultrathin ferromagnetic iron-palladium alloy films using spin-resolved momentum microscopy. Momentum microscopy enables the two-dimensional detection of photoelectrons with an in-plane crystal momentum over the full Brillouin zone. By employing an imaging spin filter, spin-resolved momentum maps of the iron-palladium alloy were acquired. Breaking of time reversal symmetry by the remanent magnetization of the film manifests in a pronounced anisotropy of the electron states in the Fermi surface. In particular, the competition between exchange interaction and strong spin-orbit coupling in the FePd alloy leads to the formation of wave-vector dependent local gaps in the Fermi surface. Moreover, the spin-resolved maps recorded by the momentum microscope give evidence for a non-collinear spin texture of the electron states at the Fermi surface, where the local spin polarization vector points orthogonal to the remanent magnetization of the sample.