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O: Fachverband Oberflächenphysik
O 52: Poster Session IV: Poster to Mini-Symposium: Infrared nano-optics II
O 52.1: Poster
Dienstag, 2. März 2021, 13:30–15:30, P
Local infrared properties of pure antimony in reduced dimension — •Max Dario Siebenkotten1, Konstantin Wirth1, Peter Kerres1, Lisa Schäfer1, Anne Frommelius2, Ulrich Simon2, Matthias Wuttig1, and Thomas Taubner1 — 1Institute of Physics (IA), RWTH Aachen — 2Institute of Inorganic Chemistry, RWTH Aachen
Much progress has been made in recent years in advancing phase-change materials (PCMs) towards becoming a commercial random access memory (RAM) technology [1]. One major remaining issue is that the precise stoichiometry in the region of interest in PCM memory cells still eludes control, particularly when that region is repeatedly switched between its amorphous and crystalline state [2]. Pure antimony is a PCM and recently it has been shown that switching can be achieved when it is confined in reduced dimensions [2].
In this work the infrared optical properties of antimony thin films and nanoparticles are investigated by scattering type scanning near-field optical microscopy (s-SNOM). s-SNOM allows for the study down to the single nanoparticle level. The antimony nanoparticles show distinguishable infrared optical response, at least statistically, between their amorphous and crystalline phase. Confined antimony is found to show pronounced differences to bulk antimony in the infrared, as has been shown for the optical region on thin films before [3].
[1] Kooi, Wuttig, Adv. Mater. 32, 1908302 (2020)
[2] Salinga et al., Nat. Mater. 17, 681-685 (2018)
[3] Cheng et al., arXiv:2008.09007 (2020)