Using microwave ultrasonic interferometry we have studied the relaxation dynamics of an order‐order transition in an Ising antiferromagnet. The system is prepared in one antiferromagnetic phase and relaxes to its thermodynamically inequivalent time‐reversed conjugate, driven by an induced staggered field. The time‐reversed phases induce equal and opposite changes in the velocity of transverse polarized ultrasonic waves and this is exploited by the interferometer to monitor the volume fractions of the conjugate phase during the relaxation process. The results indicate that the relaxation is dominated in the initial stages by domain growth of the stable phase as opposed to nucleation‐dominated growth. This process can be closely fitted by a time‐cubed growth law for the domains of stable phase. The final stages are well approximated by exponential behavior.
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1 May 1990
Research Article|
May 01 1990
Relaxation dynamics of metastable antiferromagnetic states
J. F. Gregg;
J. F. Gregg
Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
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W. Kob;
W. Kob
Institut f ür Physik, Universität Basel CH 4056, Switzerland
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J. S. Lord;
J. S. Lord
Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
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I. D. Morris;
I. D. Morris
Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
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J. Z. Pfeffer;
J. Z. Pfeffer
Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
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R. Schilling;
R. Schilling
Institut f ür Physik, Universität Basel CH 4056, Switzerland
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M. R. Wells;
M. R. Wells
Clarendon Laboratory, Oxford OX1 3PU, United Kingdom
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W. P. Wolf
W. P. Wolf
Becton Center, Yale University, New Haven Connecticut 06520
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J. Appl. Phys. 67, 5430–5432 (1990)
Citation
J. F. Gregg, W. Kob, J. S. Lord, I. D. Morris, J. Z. Pfeffer, R. Schilling, M. R. Wells, W. P. Wolf; Relaxation dynamics of metastable antiferromagnetic states. J. Appl. Phys. 1 May 1990; 67 (9): 5430–5432. https://doi.org/10.1063/1.344579
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