SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 26: Non-Skyrmionic Magnetic Textures II

MA 26.1: Hauptvortrag

Mittwoch, 29. März 2023, 09:30–10:00, HSZ 401

The self-induced spin glass: the perplexing magnetism of elemental neodymium — •Alexander Khajetoorians — Institute for Molecules and Materials, Radboud University, Nijmegen, The Netherlands

Spin glasses are a class of disordered magnetic materials characterized by a flat multi-well energy landscape that exhibits aging dynamics. Spin glass behavior is often described by two key ingredients: (a) competing spin interactions, and (b) external disorder. It was recently proposed that a special type of spin glass can be realized, solely by competing interactions (1). In 2020 (2), we discovered that the controversial and perplexing magnetic state of elemental Nd(0001) is a self-induced spin glass. Using spin-polarized scanning tunneling microscopy/spectroscopy (SP-STM/STS), we found that the zero-field state shows a multiplicity of favorable short-range ordered Q-states, but in the absence of long-range order. The magnetic state shows aging dynamics, and it stems from frustrated indirect exchange. More recently (3), we showed that with increasing temperature, frustration is broken leading to a long-range ordered multi-Q state. In this talk, I will review the concept of the self-induced spin glass in Nd. Moreover, I will discuss new results concerning the aging dynamics and magnetic phase diagram of the material, as well as perspectives to use such multi-well systems for new memory and computing applications. [1] A. Principi, M.I. Katsnelson, PRL, 117, 137201 (2016); [2] U. Kamber et al, Science, 368, 6494 (2020); [3] B. Verlhac, L. Niggli, et al, Nature Physics, 18, 905 (2022)