Use of nuclear spin noise spectroscopy to monitor slow magnetization buildup at millikelvin temperatures

Pöschko, Maria Theresia and Peat, David and Owers-Bradley, John and Müller, Norbert (2016) Use of nuclear spin noise spectroscopy to monitor slow magnetization buildup at millikelvin temperatures. ChemPhysChem, 17 (19). pp. 3035-3039. ISSN 1439-4235

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At ultralow temperatures, longitudinal nuclear magnetic relaxation times become exceedingly long and spectral lines are very broad. These facts pose particular challenges for the measurement of NMR spectra and spin relaxation phenomena. Nuclear spin noise spectroscopy is used to monitor proton spin polarization buildup to thermal equilibrium of a mixture of glycerol, water, and copper oxide nanoparticles at 17.5 mK in a static magnetic field of 2.5 T. Relaxation times determined in such a way are essentially free from perturbations caused by excitation radiofrequency pulses, radiation damping, and insufficient excitation bandwidth. The experimental spin-lattice relaxation times determined on resonance by saturation recovery with spin noise detection are consistently longer than those determined by using pulse excitation. These longer values are in better accordance with the expected field dependence trend than those obtained by on-resonance experiments with pulsed excitation.

Item Type: Article
Keywords: magnetic properties, nanoparticles, NMR spectroscopy, radiation damping, spin relaxation
Schools/Departments: University of Nottingham, UK > Faculty of Science > School of Physics and Astronomy
Identification Number:
Depositing User: Owers-Bradley, John
Date Deposited: 21 Dec 2016 13:30
Last Modified: 27 Jun 2018 09:35

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