Reorientation phase transition in temperature in a two- and three-dimensional ferromagnet with the account of magnetoelastic coupling

In the paper, we have investigated reorientation phase transitions in a two-dimensional ferromagnet. It is shown that the account of magnetoelastic coupling results in the appearance of an angular phase, and the phase transitions are of the first order. The temperature interval of the angular phase existence is determined mainly by elastic and magnetoelastic parameters of the system. For a three-dimensional system the observable effect disappears. The obtained results are consistent with experimental data.