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Nanoparticle magnetization measurements by a high sensitive nano-superconducting quantum interference device

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6 Author(s)
Russo, R. ; Istituto di Cibernetica “E. Caianiello” del Consiglio Nazionale delle Ricerche, Pozzuoli (Napoli), Italy ; Granata, C. ; Esposito, E. ; Peddis, D.
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A high sensitive nano superconducting quantum interference device (nanoSQUID) operating as a magnetic flux to critical current transducer with a suitable feedback circuit is employed to measure the magnetization of ferrimagnetic iron oxide nanoparticles. An improved SQUID responsivity has been obtained by using a loop inductance asymmetry. Iron oxide nanoparticles having a mean diameter of 8 nm have been excited by applying a polarizing field in the plane of the nanoSQUID loop. The field dependence of the nanoparticle magnetization at T = 4.2 K shows magnetic hysteresis. Magnetic relaxation measurements are reported and compared with those obtained by using a commercial measurement system.

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Applied Physics Letters  (Volume:101 ,  Issue: 12 )