Regensburg 2025 – scientific programme
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MA: Fachverband Magnetismus
MA 46: Surface Magnetism
MA 46.7: Talk
Friday, March 21, 2025, 11:15–11:30, H19
Quantifying the interplay between local order and dynamics in a self-induced spin glass — •Lorena Niggli1, Julian H. Strik1, Anders Bergman2, Mikhail I. Katsnelson1, Daniel Wegner1, and Alexander A. Khajetoorians1 — 1Institute for Molecules and Materials, Radboud University, Nijmegen, The Nether- lands — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
Spin glasses are a puzzling form of magnetic matter characterized by an amorphous spin texture in space. They exhibit ongoing magneti- zation dynamics that are often referred to as aging. However, direct experimental access to the spatially dependent magnetization and its link to aging, has been limited. Here, we study the spatiotemporal dy- namics of the self-induced spin glass state of Nd(0001) [1, 2]. To this end, we induce magnetization dynamics through magnetic field cycles and resolve the local order using spin-polarized scanning tunneling microscopy. We develop a new method to access the spatiotemporal dynamics based on a wavelet transformation. Using this, we quantify the Q-dependent local order in space and follow its evolution over time. Together this provides insight into the complex energy landscape of a (self-induced) spin glass. [1] Kamber et al., Science 368 (2020). [2] Verlhac et al., Nature Physics 18 (2022).
Keywords: Spin glass; Complex Magnetism; SP-STM; Aging; Frustration