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Loop-Gap Resonators: EM Material Properties Measured at Microwave Frequencies University of British Columbia Okanagan Campus Kelowna, British Columbia, Canada October 8, 2019 http://physics.ok.ubc.ca/welcome.html Loop-Gap Resonator (LGR)

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University of British Columbia – Okanagan Campus Kelowna, British Columbia, Canada http://physics.ok.ubc.ca/welcome.html

Loop-Gap Resonators: EM Material Properties Measured at Microwave Frequencies

October 8, 2019

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PHYS 331 – October 8, 2019 Jake Bobowski 2

Loop-Gap Resonator (LGR)

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PHYS 331 – October 8, 2019 Jake Bobowski 3

Extracting Material Properties

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PHYS 331 – October 8, 2019 Jake Bobowski 4

Extracting Material Properties

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PHYS 331 – October 8, 2019 Jake Bobowski 5

Extracting Material Properties

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PHYS 331 – October 8, 2019 Jake Bobowski 6

Loop-Gap Resonator (LGR)

filled Low Q empty High Q

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PHYS 331 – October 8, 2019 Jake Bobowski 7

Toroidal Loop-Gap Resonator (TLGR)

The toroidal geometry confines the magnetic field lines thereby supressing radiation losses.

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PHYS 331 – October 8, 2019 Jake Bobowski 8

Partially-Filled TLGR

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PHYS 331 – October 8, 2019 Jake Bobowski 9

Taylor et al., (2014) PLOS ONE 9(6): e100259

2 mL Molday ION from BioPAL Fe3O4 (magnetite) nanoparticle suspension

TLGR & USPIO Sample

Coupling loop 1.5 inches H(C6H10O5)xOH

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PHYS 331 – October 8, 2019 Jake Bobowski 10

Complete Equivalent-Circuit Model

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PHYS 331 – October 8, 2019 Jake Bobowski 11

Static Magnetic Field Scan – Al2O3

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PHYS 331 – October 8, 2019 Jake Bobowski 12

Permeability vs Static Magnetic Field – Al2O3

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PHYS 331 – October 8, 2019 Jake Bobowski 13

Permeability vs Static Magnetic Field – TiO2

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PHYS 331 – October 8, 2019 Jake Bobowski 14

Permeability vs Static Magnetic Field – Ferromagnetic Resonance in a magnetic nanosuspension

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PHYS 331 – October 8, 2019 Jake Bobowski 15

Thank You

References:

  • J. Dubreuil and J. S. Bobowski, Journal of Magnetism and Magnetic Materials 489, 165387 (2019)
  • J. S. Bobowski, American Journal of Physics 81, 899 (2013)
  • J. S. Bobowski and H. Nakahara, Review of Scientific Instruments 87, 024701 (2016)