Magnetic Monopole Noise

Abstract

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Monopole density and antiferromagnetic domain control in spin-ice iridates

“…Since the early indirect evidence of magnetic monopoles in spin ice [14], much effort has been devoted to their direct detection and characterisation, and in particular to measuring their density in experiments. The monopole density relates to both thermodynamic and dynamic properties of these materials, and several techniques have been proposed as a measurement proxy, for example specific heat [15], neutron scattering [16,17], and magnetic susceptibility and noise measurements [13,25,[29][30][31][32][33]. Our results show that the form of the magnetoresistance of the spin ice Ho 2 Ir 2 O 7 is strongly linked to the concentration of magnetic monopoles, in a way that holds promise to develop a readily measurable and versatile experimental indicator of their density.…”

Magnetic monopole density and antiferromagnetic domain control in spin-ice iridates

“…Since the early indirect evidence of magnetic monopoles in spin ice 8 , much effort has been devoted to their direct detection and characterisation, and in particular to measuring their density in experiments. The monopole density relates to thermodynamic and dynamic properties of these materials, and several techniques have been proposed as a measurement proxy, including specific heat 9 , neutron scattering 10,11 , and magnetic susceptibility and noise measurements 7,19,[27][28][29][30][31] . Our results show that the isothermal magnetoresistance of Ho 2 Ir 2 O 7 is strongly linked to the concentration of magnetic monopoles, in a way that holds promise to develop a readily measurable and versatile experimental indicator of their density.…”

Search of spin-dependent fifth forces with precision magnetometry

“…As it does not violate parity and time reversal, its coupling constant is much larger than that for spin and mass, making it preferred for axion detection [27]. We finally mention that a closely similar, and possibly simpler, setup could be used to probe the gravitoelectromagnetic effects of Earth rotation on the elementary spin [46,47], or the local presence of moving magnetic monopoles [48,49]. also thank Fulvio Calaon and Enrico Berto for their help with the construction and test of the apparatus, and Ruggero Pengo for the advices on the cryogenics.…”