Berlin 2024 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 70: Poster: Spins on Surfaces & Surface Magnetism
O 70.16: Poster
Mittwoch, 20. März 2024, 18:00–20:00, Poster C
Aging in the self-induced spin glass Nd(0001) — 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 Netherlands — 2Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden
Elemental neodymium has been shown to be a self-induced spin glass, where glassy behaviour stems solely from the frustrated nature of the magnetic interactions [1]. This contrasts with traditional spin glasses, where the presence of disorder is essential toward realizing glassy behaviour. The magnetic state of Nd(0001) is characterized by a lack of long range order, but exhibits local non-collinear order (Q-states). Upon increasing the temperature, neodymium displays an unusual magnetic phase transition from a self-induced spin glass to a long-range ordered multi-Q phase [2]. Here, we explore the aging behaviour of Nd(0001) in its self-induced spin glass state using spin-polarized scanning tunneling microscopy in varying magnetic fields and variable temperature. We explore how the favourability of the Q-states evolves as we age the system and relate these changes to the preferred structure of the ordered phase. These observations indicate that neodymium may be a multi-well system, which deviates from the traditional energy landscape expected of spin glass systems, thus providing a new platform to study aging dynamics as well as dynamic heterogeneity.
[1] U. Kamber et al., Science 368 (2020).
[2] B. Verlhac et al., Nat. Phys. 18 (2022).
Keywords: Spin glass; Neodymium; Magnetism; Aging; SP-STM