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arXiv · 2001.08940

Axion search with a quantum-limited ferromagnetic haloscope

N. Crescini·D. Alesini·C. Braggio·G. Carugno·D. D Agostino·D. Di Gioacchino·P. Falferi·U. Gambardella·C. Gatti·G. Iannone·C. Ligi·A. Lombardi·A. Ortolan·R. Pengo·G. Ruoso·L. Taffarello
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Abstract

A ferromagnetic axion haloscope searches for Dark Matter in the form of axions by exploiting their interaction with electronic spins. It is composed of an axion-to-electromagnetic field transducer coupled to a sensitive rf detector. The former is a photon-magnon hybrid system, and the latter is based on a quantum-limited Josephson parametric amplifier. The hybrid system consists of ten 2.1 mm diameter YIG spheres coupled to a single microwave cavity mode by means of a static magnetic field. Our setup is the most sensitive rf spin-magnetometer ever realized. The minimum detectable field is $5.5\times10^{-19}\,$T with 9 h integration time, corresponding to a limit on the axion-electron coupling constant $g_{aee}\le1.7\times10^{-11}$ at 95% CL. The scientific run of our haloscope resulted in the best limit on DM-axions to electron coupling constant in a frequency span of about 120 MHz, corresponding to the axion mass range $42.4$-$43.1\,μ$eV. This is also the first apparatus to perform an axion mass scanning by changing the static magnetic field.

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N. Crescini, D. Alesini, C. Braggio, G. Carugno, D. D Agostino, D. Di Gioacchino, P. Falferi, U. Gambardella, C. Gatti, G. Iannone, C. Ligi, A. Lombardi, A. Ortolan, R. Pengo, G. Ruoso, L. Taffarello. 2020-01-24. Axion search with a quantum-limited ferromagnetic haloscope. https://doi.org/10.1103/physrevlett.124.171801

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