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17 Sep 2012

Volume 101, Issue 12, Articles (12xxxx)

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Appl. Phys. Lett. 101, 123901 (2012); http://dx.doi.org/10.1063/1.4751469 (4 pages)

Chin-An Lin, K. P. Huang, S. T. Ho, Mei-Wen Huang, and Jr-Hau He
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Nanoparticle magnetization measurements by a high sensitive nano-superconducting quantum interference device

R. Russo, C. Granata, E. Esposito, D. Peddis, C. Cannas, and A. Vettoliere

Appl. Phys. Lett. 101, 122601 (2012); http://dx.doi.org/10.1063/1.4751036 (4 pages) | Cited 2 times

Online Publication Date: 17 September 2012

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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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85.25.Dq Superconducting quantum interference devices (SQUIDs)
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