meander-line structure for eddy-current sensing of magnetic nanoparticles
DESCRIPTION
Oral presentation in ISMANAM 2013 in Torino (Italy)TRANSCRIPT
Meander-line structure for eddy-current sensing of
superparamagnetic nanoparticles
M. Rivas, D. Lago-Cachón, J. C. Martínez-García, J. A. GarcíaNanobioanalysis Research Group, University of Oviedo, Spain
Nano
Bio
Análisis
Magnetoimpedance-baseddetection(1/4)
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Magnetoimpedance
Co70Fe5Si10B15
ribbon
Samples and methods
Test fixture ribbon to impedance analyser(1-110 MHz) + Helmholz coils (dc field)
Superparamagnetic 10 nmFe3O4 nanoparticles
NPs deposited onto blotting paper strips
NPs detection with Co (GMI)
NPs detection
Magnetoimpedancecurve (detail)Co70Fe5Si10B15 ribbon
Increase of impedance640 mg Fe3O4
Cu-based detection(2/4)
NPs detection with Cu
NPs detection with Cu
Cu-ribbon
Co-ribbon
Origin of the detection
Changing magnetic field
Induced electromotiveforces
Switching magnetic moment
Printed Circuit Board(3/4)
Printed Circuit Board
NPs detection with PCB1
PCB1
Cu-ribbon
x 5
A frequency-related detection
Skin effect
400 mm
35
mm
Skin effect
Active area
Meander-line circuit
NPs detection with meander-structure
Meander
PCB1
x 3
Planar spiral-like circuit
NPs detection with spiral-sensor
PCB1
Spiral
x 7
Proximity effect
Cross-section of three parallel traces
Proximity effect
Cross-section of three parallel traces
Planar spiral-like circuit
Ratio over
Planar spiral-like circuit
NPs detection with 5-turn spiral
5-turns
PCB1
x 100
Conclusions(4/4)
Detection with copper: highly sensitive, low-cost and simple fabrication/handling.
Nanoparticles detection
Thinner, narrower, numerous traces.
Higher frequency.
Spiral-like configuration.
Best choices
The physical origin of the detection is the induction of emf in the copper/any conductor.
Interpretation
Yes, we can detect just with copper.
Widening applications?
Challenges
