Hysteretic NanoSQUID Sensors for Investigation of Iron Oxide Nanoparticles
作者： C. Granata , R. Russo , E. Esposito , A. Vettoliere , D. Peddis
DOI: 10.1109/TASC.2012.2234356
关键词:
摘要: Magnetic nanosensors based on niobium nano superconducting quantum interference device (nanoSQUID) have been fabricated and employed to investigate the magnetic properties of iron oxide nanoparticles. The nanoSQUIDs, by electron beam lithography, consist in a square loop interrupted two nanometric constrictions (Dayem bridges). flux capture area is 0.5 μm2 while Dayem nanobridges width length ranging from 50 90 nm 70 80 nm, respectively. Measurements current voltage (I-V) critical (IC-Φ) characteristics reported for different nanobridge dimensions. At T = 4.2 K shown hysteretic I-V characteristic triangular shaped I-Φ pattern suggesting strong deviation sinusoidal current-phase relationship. Due behavior, devices as transducer. In such configuration an overall resolution about 0.3 mΦ0 has estimated. These successfully measure field dependence time relaxation magnetization nanoparticles having mean diameter nm. experimental curves undoubtedly prove that nanoSQUIDs here can be very small
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