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Magnetic properties of iron oxide nanoparticles investigated by nanoSQUIDs

Author

Listed:
  • Carmine Granata
  • Roberto Russo
  • Emanuela Esposito
  • Antonio Vettoliere
  • Maurizio Russo
  • Anna Musinu
  • Davide Peddis
  • Dino Fiorani

Abstract

Magnetization measurements of Fe 3 O 4 nanoparticles have been performed by using a nanosized superconducting quantum interference device (nanoSQUID). The nanosensor consists of a niobium loop having an area of 0.5 μm 2 interrupted by two Dayem nanobridges. The device fabrication procedure is based on the electron beam lithography, thin film deposition and the lift-off technique. The characterization of the nanodevice at T = 4.2 K includes measurements of current-voltage, critical current vs. magnetic flux characteristic and flux noise. A proper feedback circuit has been employed to increase the dynamic range of the nanosensor. The magnetic nanoparticles under investigation have a diameter of 4 nm and 8 nm and were synthesized by thermal decomposition of metallorganic precursors in the presence of oleic acid and oleylamine as surfactants and organic solvent with high boiling point. Measurements of magnetization as a function of the external magnetic field for both nanoparticle diameters are reported at liquid helium temperature. In both cases, it can be observed an evident magnetic hysteresis indicating a blocking temperature well above 4.2 K. The reliability and the clarity of the reported measurement demonstrates that a low noise nanoSQUID is a powerful tool to investigate the properties of magnetic nano-objects. Copyright EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2013

Suggested Citation

  • Carmine Granata & Roberto Russo & Emanuela Esposito & Antonio Vettoliere & Maurizio Russo & Anna Musinu & Davide Peddis & Dino Fiorani, 2013. "Magnetic properties of iron oxide nanoparticles investigated by nanoSQUIDs," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(6), pages 1-5, June.
    • Handle: RePEc:spr:eurphb:v:86:y:2013:i:6:p:1-5:10.1140/epjb/e2013-40051-2
    DOI: 10.1140/epjb/e2013-40051-2
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