The main parameters of micromagnetic structure formation in a vicinity of a second order phase transition were determined experimentally and theoretically. The theoretical study was performed using micromagnetic approach. External magnetic eld Hc of appearance of micromagnetic structure and micromagnetic structure period Lc were determined for (001)-oriented plate with uniaxial Ku and cubic K1 magnetic anisotropy. The plate was saturated by the eld applied in its plane. In the model we assumed that magnetization vector undergoes small deviations from equilibrium if magnetic eld is slightly reduced. These deviations are periodic in nature: micromagnetic structure has a form of a plane wave. Dependences of Hc and Lc on an azimuthal angle of external magnetic eld and on anisotropy constants Ku and K1 were derived analytically in this work. Experimental studies of micromagnetic structure near the second order phase transition were conducted on (EuEr)3(FeGa)5O12 (001)-oriented 50 µm thick ferrite-garnet plate with Ku = 5700 erg/cm 3 and K1 = −3700 erg/cm 3 . Micromagnetic structure was revealed by means of magnetooptic Faraday eect. The in-plane eld was increased up to 2000 Oe. Experimentally determined values of Hc and Lc were compared with theoretical estimates.
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