Time-Resolved Measurements of Surface Spin-Wave Pulses at Millikelvin Temperatures

Abstract

Propagating magnons, due to their rich physics, could enable the development of compact microwave devices for low-temperature applications, such as quantum computing and communication. The authors study the low-temperature behavior of propagating magnetostatic surface spin waves. The change in shape of magnon pulses is found to be consistent with numerical simulations based on the dispersion relation. These results enable the engineering of low-temperature magnonic systems, as well as the use of spin waves in combination with superconducting circuits in hybrid quantum devices.