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Science 21 June 2002:
Vol. 296. no. 5576, pp. 2195 - 2198
DOI: 10.1126/science.1070731
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Reports

Coherent Spin Oscillations in a Disordered Magnet

S. Ghosh,1 R. Parthasarathy,1 T. F. Rosenbaum,1* G. Aeppli2

Most materials freeze when cooled to sufficiently low temperature. We find that magnetic dipoles randomly distributed in a solid matrix condense into a spin liquid with spectral properties on cooling that are the diametric opposite of those for conventional glasses. Measurements of the nonlinear magnetic dynamics in the low-temperature liquid reveal the presence of coherent spin oscillations composed of hundreds of spins with lifetimes of up to 10 seconds. These excitations can be labeled by frequency and manipulated by the magnetic fields from a loop of wire and can permit the encoding of information at multiple frequencies simultaneously.

1 The James Franck Institute and Department of Physics, The University of Chicago, Chicago, IL 60637, USA.
2 NEC Research Institute, 4 Independence Way, Princeton, NJ 08540, USA.
*   To whom correspondence should be addressed. E-mail: t-rosenbaum{at}uchicago.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Quantum Phase Transition of a Magnet in a Spin Bath.
H. M. Ronnow, R. Parthasarathy, J. Jensen, G. Aeppli, T. F. Rosenbaum, and D. F. McMorrow (2005)
Science 308, 389-392
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