Colloquia 2005

Towards NMR at 100 Tesla in Pulsed High Field Magnets

Professor Juergen Haase
Leibniz Institute for Solid State and Materials Research (IFW) Dresden

Date

4-5 p.m., Monday, 14 February, 2005

Location

School of Physics Common Room
Room 64 Old Main Building
The University of New South Wales

Outline

Nuclear Magnetic Resonance (NMR) methods continue to spread in research and industry with the biggest expansion occurring in medical imaging. Nearly all NMR experiments benefit from strong, static, homogeneous magnetic fields that boost sensitivity and resolution. In addition, field driven effects can only be studied at high enough fields as fascinating examples in the field of strongly correlated electrons show. In the past, superconducting magnet technology was able to raise the field strength steadily. Now, with no superconducting materials in sight that can sustain more than some 22 Tesla, various laboratories revert to resistive (Bitter-type) magnets to be able to raise the field to 33 T. Very few even employ hybrids of non-persistent superconducting and resistive magnets that consume tremendous amounts of energy to achieve 45 T. A further increase in field strength for NMR seems illusory. Outside NMR, already P. Kapitza showed that the highest magnetic fields can most easily be achieved by using pulsed currents and small coils without cooling where the coil can heat up adiabatically during the field pulse. Indeed, such pulsed magnets are increasingly being employed for measuring properties such as magneto-resisitance, magnetization and susceptibility. It was believed and it seemed proven that NMR can not be performed in such pulsed magnets. Here we will demonstrate that this is not true with the first NMR experiments at up to 60 T and beyond 2 GHz in such magnets. With specially adapted NMR techniques these magnets are not as hostile as ones thought. While this opens the possibility of performing NMR at unprecedented fields and frequencies we believe that pulsed magnets may also provide the basis for another expansion of NMR into areas where the use of supreconducting magnets was out of question.

The audience, including graduate students, are invited to meet the speaker 15 minutes beforehand over wine and cheese in the Physics Common Room.

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