Reorientation phase transition in temperature in a two-dimensional ferromagnet taking magnetoelasticity into account

Abstract

Elementary excitation spectra are investigated in a thin ferromagnetic film. The temperatures of stability of phase transitions “easy axis”–angular phase and “easy plane”–angular phase are obtained. It is shown that the reasons behind the formation of the angular phase is the presence of magnetoelastic interaction. The Curie temperature of the system under investigation is determined.

Influence of Dipole Interaction on the Phase Transitions Due to Temperature Variation in Two-Dimensional Ferromagnets

“…At the point of the phase transition this gap must equal zero. This condition gives the transition temperature, which coincides with the expression (9). Note, that the magnon spectrum (10) is in good agreement with a similar expression obtained in Ref.…”

“…It is necessary to note that taking account of dipole interaction as follows from (9), results in decreasing transition temperature (T 1 ) in comparison with the case studied in Ref. [9].…”

“…Nowadays great interest is evoked by the investigation of ultrathin films [1][2][3][4][5][6][7][8][9][10]. First of all, it is related to the fact that such objects can be used in microelectronics, e.g.…”

“…A great number of experimental [1,3] and theoretical [5][6][7][8][9][10] works is devoted to the investigation of this effect. In [1,5,7] it was shown that the process of magnetization ''switching" from the out-of-plane phase to the in-plane one occurs due to the competition between the one-site ''easy-axis" anisotropy and dipole interaction creating an effective anisotropy of the ''easy-plane" type.…”

“…However, in Refs. [9,10] another mechanism responsible for phase transitions of such kind was proposed. This mechanism is based on the model that takes into account the magnetoelastic (ME) coupling and phenomenological temperature dependence of the one-site anisotropy.…”