Volume 27, Issue 6, June 2001
Index of content:
- LOW-TEMPERATURE MAGNETISM
Influence of a large biquadratic interaction on the phase states of a non-Heisenberg biaxial ferromagnet27(2001); http://dx.doi.org/10.1063/1.1382989View Description Hide Description
A study is made of the phase states of a biaxial non-Heisenberg ferromagnet with a large biquadratic interaction in an external magnetic field. It is shown that in such systems the formation of canted phases is energetically unfavorable but that the quadrupolar and ferromagnetic phases can exist in them. The phase transitions between these phases are studied, and it is shown that they are first-order transitions. The field of the first-order transition is found. The phase stability fields are determined from an analysis of the spectra of coupled magnetoelastic waves.
27(2001); http://dx.doi.org/10.1063/1.1382990View Description Hide Description
It is shown that the destruction of the cycloidal structure of the magnetic ferroelectric by a high magnetic field leads to the onset of a linear magnetoelectric effect and the appearance of a toroidal moment. The proof of the existence of a toroidal moment T in a high magnetic field is based on the experimental observation that the off-diagonal components of the linear ME effecttensor are asymmetric for where L is the antiferromagnetic vector), inasmuch as
27(2001); http://dx.doi.org/10.1063/1.1382991View Description Hide Description
The influence of the dynamic magnetoelectric interaction on the magnon (TE) and phonon (TM) polaritons in a ferrimagnet is studied in the IR region of the spectrum. The frequency dispersion of the dielectricpermittivity and magnetic permeability is taken into account. It is shown that the spontaneous magnetic moment induces an additional radiative mode in the spectrum of TM polaritons. It is predicted that a resonant interaction and interconversion of the TM and TE polaritons can occur in a static electric field.