SKM 2023 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 20: Poster: Spins and Magnetism at Surfaces

O 20.1: Poster

Montag, 27. März 2023, 18:00–20:00, P2/EG

Aging behavior in a self-induced spin glass — Lorena Niggli, •Julian H. Strik, Anand Kamlapure, Mikhail I. Katsnelson, Daniel Wegner, and Alexander A. Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Elemental neodymium has been shown to be a so-called self-induced spin glass, which, unlike conventional spin glasses, shows glassy behavior solely from frustrated magnetic interactions and in the absence of disorder [1]. Additionally, in contrast to most conventional spin glasses, neodymium has a disorder to order transition. As the temperature increases it goes from the self-induced spin glass phase to a multi-Q long range ordered phase resulting from competing long-range interactions on different length scales [2]. This disorder to order transition might have profound effects on the metastable states and aging dynamics in the low temperature phase. In this study, we use spin-polarized scanning tunneling microscopy combined with varying external magnetic fields to investigate the aging dynamics in the spin glass phase, and quantify this in terms of the various local spin-spin correlations (Q-states) observed. These observations may have interesting implications on the aging behavior in self-induced spin glasses, which might differ from conventional spin glasses.

[1] U. Kamber et al., Science 368 (2020).

[2] B. Verlhac et al., Nat. Phys. 18 (2022).