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Sep 24 – 29, 2023
US/Eastern timezone

Spin-Dependent Fifth-Force Search and Measurement of Compensated Ferrimagnetism in Terbium Iron Garnet using Neutron Spin Echo Spectroscopy and Neutron Radiography

Sep 25, 2023, 4:25 PM
20m
Grand Ballroom 2 (Durham Convention Center)

Grand Ballroom 2

Durham Convention Center

Talk Fundamental Symmetries and Spin Physics Beyond the Standard Model Fundamental Symmetries and Spin Physics Beyond the Standard Model

Speaker

Caleb Hughes (Indiana University)

Description

Rare-earth iron garnets constitute a model system for Néel ferrimagnetism. These materials exhibit temperature-dependent orbital cancellation of the magnetism associated with the electron spins, leaving a dense ensemble of polarized electrons which are of interest as a source for exotic spin-dependent fifth-force searches. We have conducted two novel investigations of a ferrimagnetic terbium iron garnet (Tb$_{3}$Fe$_{5}$O$_{12}$) sample: one using neutron spin echo spectroscopy, the other using neutron radiography. In contrast to measurements of external fields, neutrons can probe the internal state of the ferrimagnet and determine if the cancellation of moments occurs at the unit cell level or is an emergent property as a result of compensation among inhomogeneously-distributed domains. The use of polarized neutrons in both of these techniques enabled a search for exotic interactions between the polarized electrons in the sample and incident neutrons. We describe the sample characterization, the apparatus used, as well as preliminary results.

Primary authors

Caleb Hughes (Indiana University) Prof. David Baxter (Indiana University) Prof. Josh Long (University of Illinois Urbana-Champaign) Ms Krystyna Lopez (Indiana University) Ms Lilian Lommel (Los Alamos National Laboratory) Mr Michael Van Meter (Indiana University) Prof. Mike Snow (Indiana University) Prof. Murad Sarsour (Georgia State University) Mr Thomas Mulkey (Georgia State University)

Presentation materials