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Ultra High Sensitive Niobium NanoSQUID by Focused Ion Beam Sculpting

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Abstract

The nanosuperconducting quantum interference device (nanoSQUID) is a powerful tool for nanoscience investigations. In this paper, the main features of niobium nanoSQUID based on deep submicron Josephson tunnel junctions have been investigated. The superconductive nanosensor has a rectangular loop of (1 × 0.4 μm 2) interrupted by two square Josephson junctions having a side length of 0.3 μm. The crucial steps of the fabrication process have been performed using focusing ion beam (FIB) nanosculpting technique. A full characterization of the nanosensor has been performed including the measurement of the voltage swing, the voltage responsivity, the spectral density of the magnetic flux and spin noise and the investigation of the main characteristics as a function of the temperature. Due to a very high responsivity (2.9 mV/ Φ0), the nanodevice exhibited, at T= 4.2 K, an intrinsic spectral density of the magnetic flux as low as 600 n Φ0/Hz 1/2, corresponding to a magnetic moment noise of 9 μB/Hz 1/2. For temperature less than 4.0 K, the nanodevice shows hysteretic current-voltage characteristics. However, the high critical current modulation depths ensure a suitable sensitivity for nanoscale applications.

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Author notes

  1. Roberto Russo

    Present address: Istituto di Microelettronica e Microsistemi del Consiglio Nazionale delle Ricerche, sezione di Napoli, 80131, Napoli, Italy

Authors and Affiliations

  1. Istituto di Cibernetica del Consiglio Nazionale delle Ricerche, Pozzuoli, Napoli, Italy

    Carmine Granata, Antonio Vettoliere & Roberto Russo

  2. Istituto Nazionale di Ricerca Metrologica, Torino, Italy

    Matteo Fretto, Natascia De Leo, Emanuele Enrico & Vincenzo Lacquaniti

Authors
  1. Carmine Granata
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  2. Antonio Vettoliere
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  3. Roberto Russo
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  4. Matteo Fretto
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  5. Natascia De Leo
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  6. Emanuele Enrico
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  7. Vincenzo Lacquaniti
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Correspondence to Carmine Granata.

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Granata, C., Vettoliere, A., Russo, R. et al. Ultra High Sensitive Niobium NanoSQUID by Focused Ion Beam Sculpting. J Supercond Nov Magn 28, 585–589 (2015). https://doi.org/10.1007/s10948-014-2693-y

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  • DOI: https://doi.org/10.1007/s10948-014-2693-y

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