Аннотация:The effect of temperature on the magnetic phase separation and the parameters of
spin-spiral (helical) waves is studied using a two-dimensional single-band t-t′ Hubbard model.
We obtained the dependence on the temperature of the parameters of helical magnetic phases
and magnetic phase-separation (PS) regions. With an increase in temperature, the PS regions
(AF+[Q, Q]), ([Q, Q]+[Q, π]) get substantially reduced but new PS ([Q1 , π]+[Q2 , π]), (AF+[Q, π])
arise. The results are used for the interpretation of the magnetic properties of cuprates.