Nano-Scale Devices for Frequency-Based Magnetic Biosensing
Technical Report,05 Jun 2015,04 Nov 2016
UNIVERSITY OF WESTERN AUSTRALIA CRAWLEY Australia
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We demonstrate via experiment and simulation that the magnetic-field-dependent frequency of resonant magnetization dynamics inferromagnetic nanostructures can be exploited for frequency-based detection of magnetic fields generated by magnetic nanoparticles andmicrobeads. The electronic detection of these fields is of high practical interest since suitably functionalized magnetic particles can be usedused as detection-enabling labels for biological analytes e.g. disease markers, opening pathways toward the development of solid statebiological sensors biosensors. We have demonstrated magnetic particle detection using ferromagnetic resonances in both large magnoniccrystals and, via electrical measurements, in magnetic-vortex-containing, isolated micro- and nano-devices. Via micromagnetic simulations, wehave largely determined the mechanisms underlying the observed nanoparticle-driven shifts. This resonance-based approach is particularlypromising for the development of fast, frequency-based electronic sensors for nanoparticles and microbeads which can operate in relativelyhigh magnetic fields 100s of mT and can be scaled down to have lateral dimensions on the order of 100 nm and below.
- Electricity and Magnetism