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URL:https://murmitoyen.com/events/vanille/udem/detail/166148
LOCATION:Université de Montréal - Pavillon J.-Armand-Bombardier\, 5155\, 
 chemin de la rampe \, Montréal\, QC\, Canada\, H3T 2B2
SUMMARY:Single spin sensitivity with a nano-sized SQUID-on-tip device worki
 ng at 4 K.
DESCRIPTION:Yonathan Anahory\, Department of Condensed Matter Physics\, We
 izmann Institute of Science\, Rehovot\, IsraelNanoSQUIDs residing on the 
 apex of a quartz tip\, suitable for scanning probe microscopy with record 
 size\, spin sensitivity\, and operating magnetic fields\, are presented. T
 he SQUID-on-tip (SOT) is fabricated by pulling a quartz tube into a sharp 
 pipette\, followed by three thermal evaporation steps of a thin supercondu
 cting film onto the sides and the apex of the pipette. This self-aligned f
 abrication method requires no additional lithographic processing or etchin
 g. An aluminum SOT of 200 nm diameter\, operating at 300 mK\, showed flux 
 sensitivity of Φn = 1.8 µΦ0/Hz1/2 and spin sensitivity of Sn = 65 µ
 B/Hz1/2 [1]. We have developed SOTs made of Nb and Pb that have the advan
 tage of operating at 4.2 K. The best performance was achieved with a Pb SO
 T with an effective diameter of 46 nm with Φn = 0.05 μΦ0/Hz1/2 at 4.2
  K that was operational up to unprecedented high fields of 1 T. This corre
 sponds to a spin sensitivity of Sn = 0.34 μB/Hz1/2\, which is more than 
 one order of magnitude more sensitive than that of any other SQUID to date
 . This extraordinary sensitivity\, combined with the ability of the SQUID-
 on-tip to scan the sample within a few nm from the sample surface\, opens 
 the pathway to direct imaging and investigation of magnetic moments as sma
 ll as those of a single electron spin. I will also present a SOT that can 
 measure both in-plane and out-of-plane component of the magnetic field.Ref
 :A. Finkler\, Y. Segev\, Y. Myasoedov\, M. L. Rappaport\, L. Neeman\, D. V
 asyukov\, E. Zeldov\, M. E. Huber\, J. Martin and A. Yacoby\, Nano Lett.
  10\, 1046 (2010)  Site web du groupe du Dr. AnahoryCette conférence e
 st présentée par le RQMP Versant Nord du Département de physique de l'
 Université de Montréal et le Département de génie physique de Polytech
 nique Montréal.
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