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TT: Fachverband Tiefe Temperaturen
TT 93: Superconductivity – Poster II
TT 93.7: Poster
Donnerstag, 12. März 2026, 18:00–20:00, P4
Development of Lenz lenses for NMR of micron-sized superconductors — •P. Swatosch1,2, H. Kühne1, F. Bärtl1,2, and J. Wosnitza1,2 — 1Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ctd.qmat, HZDR — 2IFMP, TU Dresden
Nuclear magnetic resonance (NMR) experiments on novel superconductors are often limited in their sensitivity when only submillimeter-sized samples are available, as in this case only a few nuclear spins contribute to the measurement signal, resulting in a low signal-to-noise ratio.
One approach to solving this problem is to locally focus the high-frequency magnetic field of the NMR experiment in the sample volume. For this, structured conductor geometries in the form of Lenz lenses can amplify and shape magnetic fields through targeted eddy currents.
For this purpose, we have performed comprehensive numerical simulations of the spatial distribution of electromagnetic fields.
Based on geometries that have already proven useful in earlier studies [1-3], we have modeled various designs and evaluated them with respect to their field-focusing capabilities and NMR signal.
The results provide a basis for the fabrication of optimized Lenz-lens geometries for highly sensitive NMR measurements of small-volume samples.
[1] Meier et al., Sci. Adv. 3, eaao5242 (2017)
[2] Schoenmaker et al., Rev. Sci. Instrum. 84, 085120 (2013)
[3] Sprengler et al., PLoS ONE 12, e0182779 (2017)
Keywords: NMR sensitivity; Lenz lenses; RF field enhancement; Numerical simulations