SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 37: Poster Session III: Surface magnetism III
O 37.6: Poster
Dienstag, 2. März 2021, 10:30–12:30, P
Internal magnetic field increase at surface and interface of palladium thin films — •Gesa Welker1, Martin de Wit1, Tjerk H. Oosterkamp1, John A. Mydosh1, Thomas Prokscha2, and Lucia Bossoni1,3 — 1Leiden Institute of Physics, Leiden University, The Netherlands — 2Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, Villingen, Switzerland — 3C.J. Gorter Center for High Field MRI, Department of Radiology, Leiden University Medical Center, The Netherlands
We experimentally investigated three undoped and iron-doped palladium (Pd) 100 nm thin films and found an increased internal magnetic field at the surface and interface compared to the bulk-like middle of the film. Pd surfaces have recently become of interest in the field of spin-orbitronics. Furthermore Pd nanomaterial shows many applications where surface properties play a role, such as for example catalysis, magnetoresistance spin valves and phase coherence superconducting junctions. Understanding the magnetic surface properties of Pd is therefore relevant for various fields of research.
In our low-energy muon spin spectroscopy (MuSR) study, we implanted muons in Pd samples at varying depths to probe the local magnetic field in the implantation region. The field increase at the surface/interface is temperature-independent, stronger for iron-doped samples, accompanied by an increased field inhomogeneity and extending over a few nanometers. We discuss potential origins for this magnetic surface state. Orbital moments induced by the surface/interface and localized spins/charges are the most likely explanation.