Effects of Finite Material Size On Axion-magnon Conversion
High Energy Physics - Phenomenology2024-02-19v2Cosmology and Nongalactic AstrophysicsHigh Energy Astrophysical PhenomenaHigh Energy Physics - Experiment
Magnetic materials are particularly favorable targets for detecting axions interacting with electrons because the collective excitation of electron spins, the magnon, can be excited through the axion-magnon conversion process. It is often assumed that only the zero-momentum uniformly precessing magnetostatic (Kittel) mode of the magnon is excited. This is justified if the de Broglie wavelength of the axion is much longer than the size of the target magnetic material. However, if the de Broglie wavelength is shorter, finite-momentum magnon modes can also be excited. We systematically analyze the target material size dependence of the axion-magnon conversion rate. We discuss the importance of these effects in the detection of relativistic axions as well as in the detection of axion dark matter of relatively heavy mass with large material size.
@article{arxiv.2310.17704,
title = {Effects of Finite Material Size On Axion-magnon Conversion},
author = {So Chigusa and Asuka Ito and Kazunori Nakayama and Volodymyr Takhistov},
journal= {arXiv preprint arXiv:2310.17704},
year = {2024}
}