A study of helium-3 nuclear magnetic relaxation mechanism in contact with 20 nm DyF3 nanoparticles

Adeliya Garaeva; Ekaterina Boltenkova; Kajum Safiullin; Irina Romanova; Egor Alakshin

doi:10.1016/j.jmr.2024.107672

A study of helium-3 nuclear magnetic relaxation mechanism in contact with 20 nm DyF₃ nanoparticles

J Magn Reson. 2024 May:362:107672. doi: 10.1016/j.jmr.2024.107672. Epub 2024 Apr 22.

Authors

Adeliya Garaeva¹, Ekaterina Boltenkova², Kajum Safiullin¹, Irina Romanova¹, Egor Alakshin¹

Affiliations

¹ Kazan Federal University, Institute of Physics, Kremlevskaya 18, Kazan 420008, Russian Federation.
² Kazan Federal University, Institute of Physics, Kremlevskaya 18, Kazan 420008, Russian Federation. Electronic address: katarina.kondratyeva@gmail.com.

PMID: 38653143
DOI: 10.1016/j.jmr.2024.107672

Abstract

The spin kinetics of adsorbed and liquid ³He in contact with a mixture of LaF₃ (99.67 %) and DyF₃ (0.33 %) 20 nm powders at temperatures of 1.5-4.2 K in magnetic fields up to 505mT was studied by pulsed nuclear magnetic resonance (NMR). Two-component of nuclear magnetic relaxation was observed in the experiment and theoretical relaxation model was proposed. The possible explanation of this phenomena can be carried out by a model that consider the exchange of magnetization of helium-3 nuclei located in the adsorbed layer and in the bulk of the liquid. The proposed relaxation model can be applied to other systems with the strong influence of adsorbed layer.

Keywords: Helium-3; Nanoparticles; Nuclear magnetic resonance; Relaxation mechanism.