The effect of elastic strains on antiferromagnetic phase transitions is considered. For cases in which the magnetic and chemical unit cells coincide, the combination of a strain and an applied field is found to lead to the possibility of a linear magnetoelastic (LME) coupling which may induce antiferromagnetic order, even in the normally paramagnetic phase. Such an effect can, in principle, destroy any second‐order phase transition. An order of magnitude estimate shows that the effect is small but not negligible, and that it may explain a number of unusual effects observed in dysprosium aluminum garnet, including anomalous neutron scattering, magnetic hysteresis and magnetostriction. Similar strain‐induced effects may be important in many other antiferromagnets, including CoF2, FeF2, MnF2, and αFe2O3, as well as in mixed crystals with the same structures. Strain gradients may produce similar effects in other antiferromagnets which are magnetoelectric, including DyPO4, DyAlO3, and Cr2O3.
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15 April 1988
Research Article|
April 15 1988
Magnetoelastic effects on antiferromagnetic phase transitions (invited)
W. P. Wolf;
W. P. Wolf
Yale University, Applied Physics, Becton Center, P. O. Box 2157, New Haven, Connecticut 06520
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C. H. A. Huan
C. H. A. Huan
University of Oxford, Clarendon Laboratory, Oxford 0X1 3PU, United Kingdom
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J. Appl. Phys. 63, 3904–3909 (1988)
Citation
W. P. Wolf, C. H. A. Huan; Magnetoelastic effects on antiferromagnetic phase transitions (invited). J. Appl. Phys. 15 April 1988; 63 (8): 3904–3909. https://doi.org/10.1063/1.340601
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