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Abstract
A new type of acoustomagnetic spectometer is described. This instrument is based on the use of a superconducting quantum interference device (SQUID) to directly detect changes in sample magnetization induced by acoustic waves. The principles embodied in this new technique are explained. The results of experimental work done with the instrument are given.
The first observation of SQUID-detected acoustomagnetic effects in solids is reported. In particular, SQUID-NAR (nuclear acoustic resonance) techniques have been used to measure spin lattice relaxation times and to observe the continuous wave NAR in tantalum metal between 1.58 - 4.2 K.
The acoustic nuclear quadrupole resonance (ANQR) spectra and spin-lattice relaxation times of ('121)Sb and ('123)Sb in antimony metal have also been measured by means of the SQUID acoustomagnetic spectrometer. Novel features of the SQUID-detected ANQR spectra are described. In particular, the first measurement of magnetic field-dependent nuclear spin relaxation rates in a bulk metal is reported.
