Ferromagnetic gyroscopes for tests of fundamental physics

Pavel Fadeev, Chris Timberlake, Tao Wang, Andrea Vinante, Y. B. Band, Dmitry Budker, Alexander O. Sushkov, Hendrik Ulbricht, Derek F. Jackson Kimball

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

A ferromagnetic gyroscope (FG) is a ferromagnet whose angular momentum is dominated by electron spin polarization and that will process 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 determination 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 due to an effect 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.

Original languageEnglish
Article number024006
JournalQuantum Science and Technology
Volume6
Issue number2
DOIs
StatePublished - 1 Apr 2021

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Materials Science (miscellaneous)
  • Physics and Astronomy (miscellaneous)
  • Electrical and Electronic Engineering

Fingerprint

Dive into the research topics of 'Ferromagnetic gyroscopes for tests of fundamental physics'. Together they form a unique fingerprint.

Cite this