Abstract
High-magnetic-field nuclear magnetic resonance (NMR) has manifested itself as an indispensable tool in modern scientific research in the fields of physics, chemistry, materials science, biology, and medicine, among others, owing to its great advantages in both measurement sensitivity and quantum controllability. At present, the use of pulsed fields is the only controllable and nondestructive way to generate high magnetic fields of up to 100 T. NMR combined with pulsed fields is therefore considered to have immense potential for application in multiple scientific and technical disciplines. Irrespective of the paramount technical challenges, including short duration of the pulsed fields, unstable plateaus, and poor field homogeneity and reproducibility, great progress has been made in a number of pulsed-field laboratories in Germany, France, and Japan. In this paper, we briefly review the status of the pulsed-field NMR technique, as well as its applications in multiple disciplines. We also discuss future trends with regard to the upgrading of pulsed-field NMR.
Highlights
Since Rabi invented the magnetic resonance method to study the nuclear magnetism of gaseous atoms in 1944, research achievements related to nuclear magnetic resonance (NMR) have won five Nobel Prizes for work in areas including nuclear spin, spectral transformation, and magnetic resonance imaging (MRI): two in Physics, two in Chemistry, and one in Medicine
They carried out NMR experiments on 63Cu under 12 T and 33 T pulsed high magnetic fields, and selected a time window near the peak to trigger the RF pulse at a fixed point, obtaining the results shown in Fig. 2.32 there is a large ripple and the linewidth is not ideal, this was the first time that a useful free induction decay (FID) signal had been collected in a pulsed field, and it marked the germination of pulsed-magnetic-field NMR (PF-NMR) technology
The LNCMI group used a pulsed high-magnetic-field technique to further increase the background field intensity and obtained a PF-NMR spectrum of LiCuVO4 at 56 T, as shown in Fig. 16.89 The result shows that the phase transition from a spin density waves (SDWs) state to a magnetic saturation state occurs in the range 42.41 T–43.55 T with increasing magnetic field intensity (H c)
Summary
Since Rabi invented the magnetic resonance method to study the nuclear magnetism of gaseous atoms in 1944, research achievements related to nuclear magnetic resonance (NMR) have won five Nobel Prizes for work in areas including nuclear spin, spectral transformation, and magnetic resonance imaging (MRI): two in Physics, two in Chemistry, and one in Medicine. With the increasing demand for high-throughput and multidimensional studies, in order to improve the SNR, it is necessary to perform multiple signal sampling, which results in massive amounts of data, and the time required has become a major constraint on applications.[4] The SNR of an NMR spectrogram has a power-law dependence on the magnetic field intensity: SNR}γf3/2}γ5/2B3/2,. On the one hand, a higher background field significantly enhances the SNR of the resonance signal, which reduces the time required for an experiment allowing study of the structure and dynamical changes of biological macromolecules with molecular weights up to several megadaltons. A high magnetic field can directly affect the electronic state and quantization of matter and significantly change the electronic structure, leading to special properties that would not appear under normal circumstances This provides further motivation for the development of NMR techniques in higher magnetic fields, especially unstable pulsed fields.
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