Cavity resonator for circularly polarized microwave irradiation mounted on a cryostat

We have constructed a cylindrical cavity resonator with a hybrid coupler where circularly polarized microwaves can be irradiated to a sample. The polarity of the microwave can be switched by changing the input ports of the hybrid coupler. The cavity resonator is small enough to be mounted on a cryos...

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Bibliographic Details
Published in:Review of scientific instruments 2019-08, Vol.90 (8), p.084707-084707
Main Authors: Arakawa, T., Norimoto, S., Iwakiri, S., Asano, T., Niimi, Y.
Format: Article
Language:English
Subjects:
Cavity resonators
Circular polarization
Couplers
Irradiation
Microwaves
Polarity
Quantum phenomena
Scientific apparatus & instruments
Spintronics
Tensors
Yttrium
Yttrium-iron garnet
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Summary:We have constructed a cylindrical cavity resonator with a hybrid coupler where circularly polarized microwaves can be irradiated to a sample. The polarity of the microwave can be switched by changing the input ports of the hybrid coupler. The cavity resonator is small enough to be mounted on a cryostat which enables us to change the sample temperature in a wide range. To demonstrate the performance of the cavity resonator mounted on a cryostat, Yttrium Iron Garnet (YIG) was used as a test sample. We succeeded in selectively exciting left and right circularly polarized modes with high polarization (>80%). We also evaluated the susceptibility tensor of YIG in the cryostat. The technique presented here would offer a new direction in the fields of spintronics and quantum information.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.5098846