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

P�schko, Maria Theresia; Peat, David; Owers-Bradley, John; M�ller, Norbert

Abstract

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.

Citation

Pöschko, M. T., Peat, D., Owers-Bradley, J., & Müller, N. (2016). Use of nuclear spin noise spectroscopy to monitor slow magnetization buildup at millikelvin temperatures. ChemPhysChem, 17(19), https://doi.org/10.1002/cphc.201600323

• Journal Article Type: Article
• Acceptance Date: Jun 15, 2016
• Online Publication Date: Jul 22, 2016
• Publication Date: Oct 5, 2016
• Deposit Date: Dec 21, 2016
• Publicly Available Date: Dec 21, 2016
• Journal: ChemPhysChem
• Print ISSN: 1439-4235
• Electronic ISSN: 1439-4235
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 17
• Issue: 19
• DOI: https://doi.org/10.1002/cphc.201600323
• Keywords: magnetic properties, nanoparticles, NMR spectroscopy, radiation damping, spin relaxation
• Public URL: https://nottingham-repository.worktribe.com/output/824658
• Publisher URL: http://onlinelibrary.wiley.com/doi/10.1002/cphc.201600323/abstract