Nonreciprocity in Cavity Magnonics at Milikelvin Temperature

TL;DR

This paper demonstrates how cavity magnonics at millikelvin temperatures can be used to achieve non-reciprocal microwave signal control, highlighting the coexistence of coherent and dissipative interactions for potential on-chip applications.

Contribution

It provides experimental evidence of non-reciprocity in cavity magnonics at cryogenic temperatures, combining theory and measurements to explore device performance.

Findings

Coexistence of coherent and dissipative coupling at cryogenic temperatures

Achieved directional isolation using combined interactions

Measured key metrics like isolation, bandwidth, and insertion loss

Abstract

Incorporating cavity magnonics has opened up a new avenue in controlling non-reciprocity. This work examines a yttrium iron garnet sphere coupled to a planar microwave cavity at milli-Kelvin temperature. Non-reciprocal device behavior results from the cooperation of coherent and dissipative coupling between the Kittel mode and a microwave cavity mode. The device's bi-directional transmission was measured and compared to the theory derived previously in the room temperature experiment. Investigations are also conducted into key performance metrics such as isolation, bandwidth, and insertion loss. The findings point to the coexistence of coherent and dissipative interactions at cryogenic conditions, and one can leverage their cooperation to achieve directional isolation. This work foreshadows the application of a cavity magnonic isolator for on-chip readout and signal processing in superconducting circuitry.