Speaker
Mr
Graeme Flower
(University of Western Australia)
Description
Ferromagnetic axion haloscopes search for axion dark matter by exploiting their coupling to electrons. We present a new theoretical framework by which such devices can be understood with a Hamiltonian approach using strongly coupled cavity photons, and magnons from a spherical ferrimagnet. Particular focus is put of the operation of these devices in the dispersive regime, which allows these experiments to search over a broader frequency range with respect to the axion parameter space. An initial experiment is performed with limits set on axion to electron coupling of $g_{aee} > 3.7\times10^{-9}$
in the range $33.79 \mu$eV<$m_a$< $33.94 \mu$eV with 95% confidence. The potential range of operation of this experiment is calculated, however, to be in bands: $4.1\mu$eV centred around $34.1\mu$eV and $6.6\mu$eV centred around $41.4\mu$eV. Future improvements to the experiment are also discussed.
Primary author
Mr
Graeme Flower
(University of Western Australia)
Co-authors
Dr
Jeremy Bourhill
(University of Western Australia)
Dr
Maxim Goryachev
(University of Western Australia)
Prof.
Michael Tobar
(University of Western Australia)
