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Prospects for electron spin-dependent short-range force experiments with rare earth iron garnet test masses

A study of the possible interactions between fermions assuming only rotational invariance has revealed 15 forms for the potential involving the fermion spins. We review the experimental constraints on unobserved macroscopic, spin-dependent interactions between electrons in the range below 1 cm. An e...

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Bibliographic Details
Published in:Physical review. D, Particles, fields, gravitation, and cosmology Particles, fields, gravitation, and cosmology, 2014-06, Vol.89 (11), Article 114022
Main Authors: Leslie, T. M., Weisman, E., Khatiwada, R., Long, J. C.
Format: Article
Language:English
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Summary:A study of the possible interactions between fermions assuming only rotational invariance has revealed 15 forms for the potential involving the fermion spins. We review the experimental constraints on unobserved macroscopic, spin-dependent interactions between electrons in the range below 1 cm. An existing experiment, using 1 kHz mechanical oscillators as test masses, has been used to constrain mass-coupled forces in this range. With suitable modifications, including spin-polarized test masses, this experiment can be used to explore all 15 possible spin-dependent interactions between electrons in this range with unprecedented sensitivity. Samples of ferrimagnetic dysprosium iron garnet have been fabricated in the suitable test mass geometry and shown to have spin densities on the order of 10 super(20)h/cm super(3) with very low intrinsic magnetism.
ISSN:1550-7998
1550-2368
DOI:10.1103/PhysRevD.89.114022