The cascade process of generation of the second acoustic harmonics accompanied by its simultaneous parametric wave phase conjugation in α-Fe2O3 antiferromagnetic crystal under transversal electromagnetic field is studied experimentally and theoretically. The necessary conditions for generation at variations of the magnetization direction relatively to the crystallographic axes and direction of propagation of transversal sound wave are defined. The observed effect is caused by the magnetoelastic interaction and is described in the framework of the theory of giant effective elastic anharmonicity.
1.- Moscow state university of radio engineering, electronics and automation.78 Vernadsky prosp.,Moscow, 119454, Russia. 2.- Wave research center of the A.M.Prokhorov General physics institute RAS. 38 Vavilov str., Moscow, 119991, Russia. 3.- Institute of Electronics, Microelectronics and Nanotechnology (IEMN UMR CNRS 8520) PRES Lille North of France, ECLille, B.P. 48, 59651 Villeneuve d'Ascq Cedex, France.
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