Vito IaiaPrinciple Investigator: Professor Robert DynesMentors: Dr. Shane Cybart, Travis Wong, and Ethan Cho

Novel Magnetometer Utilizing Superconducting Electronics

Why a Magnetometer device?

Can sense weak magnetic fields Threshold magnetic

field sensor ≈10-12 T▪ Earth’s Magnetic field

≈50μT Compact Portable AdvancedCommunication applications!

MEG

Source: http://csis.org/blog/history-space-radar-brief-survey-radar-capabilities

Boeing Hawk Eye2

High Transition Superconductivity

Flow of current without resistance!

No Voltage! Yttrium

Barium Copper Oxide (YBCO) Tc = 90K

Source: http://www.devillier.com/ab_zero/get_involved/resources/topic_measuring_col

d.htm

YBCO (90K)

MgB2 (39K)

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Liquid Helium (4K)

Nb3Sn (18.3K)

Liquid Nitrogen

(77K)

Kelvin Scale

Josephson Junctions (JJ) Barrier between two superconducting

materials - (SIS) or (SNS)

Source: S.A Cybart. Planar Josephson Junctions and Arrays. Dissertation, University of California, San Diego, 2005.

4

Superconducting QUantum Interference Device (SQUID)

Two parallel Josephson Junctions Resistively Shunted Josephson (RSJ)

Magnetic flux through a SQUID is quantized Flux Quantum: φ0=h/2e Applied Magnetic field: φa

Source: J. Clarke, A.I. Braginski, The SQUID Handbook, Vol. 1, 2004.

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φa=(n+1/2) φ0

φa=nφ0φa

SQUID Pattern

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Measurement

Applied magnetic field causes SQUID pattern DC bias steepest slope for voltage

change

Applied Magnetic field

Time

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Volta

ge

Magnetic Field

What is in the Magnetometer?

What will be in this Instrument? Cryocooler Several mountable circuit boards Magnet Power Source – 24V

Rack-mountable Box

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Cryocooler

Efficient and compact 40K cooler Reliable Efficient 100W

cooler Compact Powered by Car

Battery40K

Cooler

4K Cooler

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Circuitry

Pre-Amplifier

Low-Pass Filters

1 Hz OscillatorVoltage Regulators

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On-Board Magnet Magnet producing

a couple of mT Positioned in front

of YBCO chip Important for

device characterization

Magnet for YBCO

Chip

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Conclusion

Compact Efficient Portable

Source: http://www.supraconductivite.fr

Source: http://wall.alphacoders.com/big.php?i=309497Source:

NASA12

Magnetoencephalography (MEG)

Space Systems

http://www.mnn.com/earth-matters/space/stories/military-nasa-look-to-partner-with-commercial-satellite-industry

Special Thanks! Dr. Robert Dynes Dr. Shane Cybart Graduate students: Travis Wong and Ethan Cho Undergraduate students: Bjorn Wehlin and Meng Ma UC LEADS program STARS program

THANK YOU!

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References S.A. Cybart, S.M. Anton, S.M. Wu, et. al, Nano Lett., 9 (2009). J. Clarke, A.I. Braginski, The SQUID Handbook, Vol. 1, 2004. S. Cybart, E.Y. Cho, T.J. Wong, et. al, Appl.Phys. Lett., 104 (2012). S.A Cybart. Planar Josephson Junctions and Arrays. Dissertation, University of California, San Diego,

2005. Shane A. Cybart, E. Y. Cho, T. J. Wong, et. al, App. Phys. Lett., 104, 062601 (2014). http://www.supraconductivite.fr http://www.laboratorytalk.com http://physics.aalto.fi/groups/nanospin/facilities/pulsed-laser-deposition/ybco/ http://hep.physics.indiana.edu http://www.finestdaily.com http://www.magnet.fsu.edu http://csis.org/blog/history-space-radar-brief-survey-radar-capabilities http://www.redorbit.com/news/science/1112515558/magnetic-fields-can-send-particles-to-infinity/

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