The Phase Diagram of Two-Axis Ferromagnet and Spectra of Coupled Magnetoelastic Waves |
| Yu.N. Mitsay, Yu.A. Fridman, O.V. Kozhemyako M.V. Frunze Simferopol State University, 333007, Yaltinskaya st. 4, Simferopol, Ukraine and M.S. Kochmański Institute of Physics, University of Rzeszów, Rejtana 16A, 35-310 Rzeszów, Poland |
| Received: November 5, 1998; revised version March 22, 1999; in final form July 13, 1999 |
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| The phase diagram of strongly anisotropic two-axis ferromagnet at arbitrary orientation of external magnetic field is built. It is demonstrated that together with a ferromagnetic phase there is possible the existence of phases with a tensorial order parameter: quadrupolar or quadrupolar-ferromagnetic phases. Spectra of bound magnetoelastic waves are investigated. Besides it is demonstrated that at large enough magnetoelastic interaction there is possible an active interaction of a magnetic subsystem with longitudinally polarized acoustic mode which becomes a soft mode at the point of orientational phase transition. |
| DOI: 10.12693/APhysPolA.96.445 PACS numbers: 75.10.-b |