Pulsed-field nuclear magnetic resonance: Status and prospects

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.

A Novel Low-Frequency Electromagnetic Active Inertial Sensor for Drug Detection

“…It stays at this level for a short duration (~10 µs) and then it instantly goes to zero. It is used to change the direction of the spins in order to be able to obtain information for the substance under study [3,4]. When the two fields are applied for a long time, the sample becomes saturated and a certain amount of time is needed to return to the initial state, the so-called relaxation time.…”

Home-made pulse magnet power supply for magnetizing permanent magnets and magnetic measurements

“…Bristow et al experimentally mapped out the complete upper-critical-field phase diagram of a stoichiometric superconductor, CaKFe 4 As 4 , using pulse magnetic fields of up to 90 T for the different orientations of the magnetic field and at temperatures as low as 4.2 K [1]. The observation of the elementary excitation state of the superconductor using nuclear magnetic resonance (NMR) indicates changes in the magnetic phenomena in a magnetic field up to 70 T [2,3]. Recently, neutron diffraction with static and pulsed magnetic fields has been explored to probe magnetic structures in LiNiPO 4 up to 25 T and 42 T, respectively [4].…”

“…The magnetic field is an important parameter in the fields of solid-state physics and magnetism. The magnetic field is the parameter used for observing the magnetic excited state from the ground state in the study of magnetic materials by means the electrical resistivity [1], NMR [2,3], and neutron diffraction [4]. The superconducting state of a superconductor can be determined by measuring the critical magnetic fields in which the superconducting state disappears.…”