Measurement for Spin-Dependent Fifth Force in Terbium Iron Garnet using Neutron Spin Echo Spectroscopy*

It is well known that some rare-earth iron garnets exhibit temperature dependent orbital cancellation of the magnetism associated with the electron spins while possessing non-zero net electron spin. This provides an opportunity to search for exotic spin-dependent interactions in beyond-the-Standard Model physics via spin-polarized samples with minimal magnetic background. We will discuss the results of a novel neutron-electron interaction search in the rare earth iron garnet Tb3Fe5O12 conducted at the Spallation Neutron Source using the Neutron Spin Echo beamline at Oak Ridge National Laboratory.