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Article

Термодинамика изинговых квантово-холловских ферромагнетиков при \nu=2

In the two-dimensional electron systems with strong coupling in MgZnO/ZnO heterostructures, the thermal
behavior of Ising quantum Hall ferromagnets at the filling factor nu=2 has been studied. The spin polarization
of Hall ferromagnets has been detected by measuring the signal related to the inelastic light scattering by
intrasubband spin excitons. A stepwise change in the spin polarization at the phase transition at the filling factors nu=2, 3, and 4 in the heterostructures with different electron densities has been observed. The thermal
stability of the Hall ferromagnetic phases at nu=2 has been studied and the Curie temperature has been estimated.
It has been shown that the Curie temperature is determined by the formation energy for domain walls
in the Ising quantum Hall ferromagnets.