Zugriffsnummer 55267
Dokumenttyp Zeitschriftenartikel
Peer Review mit Peer Review
Sprache Englisch
Titel Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution
Autor(in); Institution
Weber, Timur; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Jetter, Daniel Martin; University of Basel, Department of Physics, Basel, SWITZERLAND
Ullmann, Jan; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Koch, Simon A.; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Pfander, Simon F.; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Kress, Katharina; University of Basel, Department of Physics, Basel, SWITZERLAND
Vervelaki, Andriani; University of Basel, Department of Physics, Basel, SWITZERLAND
Gross, Boris; University of Basel, Department of Physics, Basel, SWITZERLAND
Kieler, Oliver; 2.4, Quantenelektronik, PTB-Braunschweig
Drechsler, Ute; IBM Research Europe Zürich, Rüschlikon, SWITZERLAND
Baral, Priya R.; École Polytechnique Fédérale de Lausanne, Institute of Physics, Lausanne, SWITZERLAND
Magrez, Arnaud; École Polytechnique Fédérale de Lausanne, Institute of Physics, Lausanne, SWITZERLAND
Kleiner, Reinhold; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Knoll, Armin W.; IBM Research Europe Zürich, Rüschlikon, SWITZERLAND
Poggio, Martino; University of Basel, Department of Physics, Basel, SWITZERLAND
Kölle, Dieter; University of Tübingen, Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Tübingen, GERMANY
Quelle/Jahr Physical Review Applied: 24 (2025), 054041-1 - 054041-11
ISSN 2331-7019
DOI
Verlag College Park, Md.: American Physical Society
Zusammenfassung Superconducting quantum interference devices (SQUIDs) are exceptionally sensitive magnetometers, capable of detecting weak magnetic fields. Miniaturizing these devices and integrating them onto scanning probes enables high-resolution imaging at low temperatures. Here, we fabricate nanometer-scale niobium SQUIDs with inner-loop sizes down to 10 nm at the apex of individual planar silicon cantilevers via a combination of wafer-scale optical lithography and focused ion beam (FIB) milling. These robust SQUID-on-lever probes overcome many of the limitations of existing devices, achieving spatial resolution better than 100 nm, magnetic flux sensitivity of 0.3 μΦ0 /√Hz, and operation in magnetic fields up to about 0.5 T at 4.2 K. Nanopatterning via Ne- or He-FIB milling allows for the incorporation of a modulation line for coupling magnetic flux into the SQUID or a third Josephson junction, for shifting its phase. Such advanced functionality, combined with high spatial resolution, large magnetic field range, and the ease of use of a cantilever-based scanning probe, extends the applicability of scanning SQUID microscopy to a wide range of magnetic, normally conducting, superconducting, and quantum Hall systems. We demonstrate magnetic imaging of skyrmions at the surface of bulk Cu2OSeO3 . Analysis of the point spread function determined from imaging a single skyrmion yields a full width at half maximum of 71 nm. Moreover, we image modulated magnetization patterns with a period of 65 nm.
Themenbereich der Metrologie Elektrizität und Magnetismus
Forschungsprojekt European Commission under H2020 FET Open Grant “FIBsuperProbes” (Grant No. 892427) and the Swiss National Science Foundation under Grant No. 200020-207933. We also gratefully acknowledge support by the COST actions NANOCOHYBRI (CA16218), FIT4NANO (CA19140),and SUPERQUMAP (CA21144).
Förderinformationen (1) Förderername: European Commission (EC)
Förderer ID: 0000 0001 2242 8989
Förderer ID Typ: ISNI
Förderprogramm: H2020 FET Open Grant "FIBsuperProbes"
Förderungsnummer: 892427
Förderinformationen (2) Förderername: Swiss National Science Foundation (SNSF)
Förderer ID: 0000 0001 0672 3101
Förderer ID Typ: ISNI
Förderungsnummer: 200020-207933
Förderinformationen (3) Förderername: European Cooperation in Science and Technology (COST)
Förderer ID: 0000 0001 1941 9627
Förderer ID Typ: ISNI
Förderprogramm: NANOCOHYBRI
Titel der Förderung: Nanoscale Coherent Hybrid Devices for Superconducting Quantum Technologies (NANOCOHYBRI)
Förderungsnummer: CA16218
Förderinformationen (4) Förderername: European Cooperation in Science and Technology (COST)
Förderer ID: 0000 0001 1941 9627
Förderer ID Typ: ISNI
Förderprogramm: FIT4NANO
Titel der Förderung: Focused Ion Technology for Nanomaterials (FIT4NANO)
Förderungsnummer: CA19140
Förderinformationen (5) Förderername: European Cooperation in Science and Technology (COST)
Förderer ID: 0000 0001 1941 9627
Förderer ID Typ: ISNI
Förderprogramm: SUPERQUMAP
Titel der Förderung: Superconducting Nanodevices and Quantum Materials for Coherent Manipulation (SUPERQUMAP)
Förderungsnummer: CA21144

Zitierung

Weber, T., Jetter, D. M., Ullmann, J., Koch, S. A., Pfander, S. F., Kress, K., Vervelaki, A., Gross, B., Kieler, O., Drechsler, U., Baral, P. R., Magrez, A., Kleiner, R., Knoll, A. W., Poggio, M., & Kölle, D. (2025). Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution. Physical Review Applied, 24, 054041-1–054041-11. https://doi.org/10.1103/6s24-vz3k

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