Effect of a negative biquadratic interaction on the phase states and spectra of coupled magnetoelastic waves of an easy-plane ferromagnet

Abstract

The spectra of the coupled magnetoelastic waves of an easy-plane ferromagnet with a negative biquadratic interaction are investigated. It is shown that in this case the existence region of the quadrupolar phase is narrowed substantially in comparison with the case of a positive biquadratic interaction. The phase diagram of the system is constructed.

Phase diagram of a spin-1 non-Heisenberg antiferromagnet

“…7,14 This raises the question of what phases can be realized in a non-Heisenberg antiferromagnet, i.e., when JϽ0 and K 0. In a ferromagnet with a negative biquadratic interaction constant (KϽ0) a ferromagnetic, quadrupolar, or quadrupolar-ferromagnetic phase can be realized.…”