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Ferromagnetic gyroscopes for tests of fundamental physics

Ferromagnetic gyroscopes for tests of fundamental physics
Ferromagnetic gyroscopes for tests of fundamental physics
A ferromagnetic gyroscope (FG) is a ferromagnet whose angular momentum is dominated by electron spin polarization and that will precess under the action of an external torque, such as that due to a magnetic field. Here we model and analyze FG dynamics and sensitivity, focusing on practical schemes for experimental realization. In the case of a freely floating FG, we model the transition from dynamics dominated by libration in relatively high externally applied magnetic fields, to those dominated by precession at relatively low applied fields. Measurement of the libration frequency enables in situ measurement of the magnetic field and a technique to reduce the field below the threshold for which precession dominates the FG dynamics. We note that evidence of gyroscopic behavior is present even at magnetic fields much larger than the threshold field below which precession dominates. We also model the dynamics of an FG levitated above a type-I superconductor via the Meissner effect, and find that for FGs with dimensions larger than about 100 nm the observed precession frequency is reduced compared to that of a freely floating FG. This is akin to negative feedback that arises from the distortion of the field from the FG by the superconductor. Finally we assess the sensitivity of an FG levitated above a type-I superconductor to exotic spin-dependent interactions under practical experimental conditions, demonstrating the potential of FGs for tests of fundamental physics.
2058-9565
Fadeev, Pavel
1aa21dcb-4154-4aab-8b7f-86b845551e98
Timberlake, Chris
0620cbe2-aff4-444a-b420-b6a48a8b85dd
Wang, Tao
0010bae7-a27b-404e-bf80-6acc8d33364b
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Band, Yehuda B
66102df0-b5b5-4cdb-981d-8e5034968355
Budker, Dmitry
2d8147c6-82b8-4e9a-8871-cb0d49b9cbea
Sushkov, Alexander O
5372fd27-4823-44a2-bbe2-8fdc213b5fda
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Kimball, Derek F Jackson
84188566-60b3-48e7-9502-b71fbbb28d6a
Fadeev, Pavel
1aa21dcb-4154-4aab-8b7f-86b845551e98
Timberlake, Chris
0620cbe2-aff4-444a-b420-b6a48a8b85dd
Wang, Tao
0010bae7-a27b-404e-bf80-6acc8d33364b
Vinante, Andrea
f023d600-0537-41c4-b307-bf9cdfc1f56c
Band, Yehuda B
66102df0-b5b5-4cdb-981d-8e5034968355
Budker, Dmitry
2d8147c6-82b8-4e9a-8871-cb0d49b9cbea
Sushkov, Alexander O
5372fd27-4823-44a2-bbe2-8fdc213b5fda
Ulbricht, Hendrik
5060dd43-2dc1-47f8-9339-c1a26719527d
Kimball, Derek F Jackson
84188566-60b3-48e7-9502-b71fbbb28d6a

Fadeev, Pavel, Timberlake, Chris, Wang, Tao, Vinante, Andrea, Band, Yehuda B, Budker, Dmitry, Sushkov, Alexander O, Ulbricht, Hendrik and Kimball, Derek F Jackson (2021) Ferromagnetic gyroscopes for tests of fundamental physics. Quantum Science and Technology. (doi:10.1088/2058-9565/abd892).

Record type: Article

Abstract

A ferromagnetic gyroscope (FG) is a ferromagnet whose angular momentum is dominated by electron spin polarization and that will precess under the action of an external torque, such as that due to a magnetic field. Here we model and analyze FG dynamics and sensitivity, focusing on practical schemes for experimental realization. In the case of a freely floating FG, we model the transition from dynamics dominated by libration in relatively high externally applied magnetic fields, to those dominated by precession at relatively low applied fields. Measurement of the libration frequency enables in situ measurement of the magnetic field and a technique to reduce the field below the threshold for which precession dominates the FG dynamics. We note that evidence of gyroscopic behavior is present even at magnetic fields much larger than the threshold field below which precession dominates. We also model the dynamics of an FG levitated above a type-I superconductor via the Meissner effect, and find that for FGs with dimensions larger than about 100 nm the observed precession frequency is reduced compared to that of a freely floating FG. This is akin to negative feedback that arises from the distortion of the field from the FG by the superconductor. Finally we assess the sensitivity of an FG levitated above a type-I superconductor to exotic spin-dependent interactions under practical experimental conditions, demonstrating the potential of FGs for tests of fundamental physics.

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More information

Accepted/In Press date: 5 January 2021
e-pub ahead of print date: 5 January 2021

Identifiers

Local EPrints ID: 446277
URI: http://eprints.soton.ac.uk/id/eprint/446277
ISSN: 2058-9565
PURE UUID: 1eec4351-30b1-475b-a1c6-27748b2b9463
ORCID for Andrea Vinante: ORCID iD orcid.org/0000-0002-9385-2127

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Date deposited: 03 Feb 2021 17:34
Last modified: 03 Feb 2021 17:34

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Contributors

Author: Pavel Fadeev
Author: Tao Wang
Author: Andrea Vinante ORCID iD
Author: Yehuda B Band
Author: Dmitry Budker
Author: Alexander O Sushkov
Author: Derek F Jackson Kimball

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