  Large scale chromomagnetic, B_3, B_8, and usual magnetic,H, fields have to be
generated in QCD after the deconfinement phase transition (DPT) at temperatures
T larger than deconfinement temperature T_d. The two former fields are created
spontaneously due to asymptotic freedom of gluon intaractions. Whereas H is
produced due to either the feature of quarks to possess both electric and color
charges or a vacuum polarization in this case. At the polarization, the vacuum
quark loops mix the external fields. As a result, B_3, B_8 become the sources
generating H. The latter field appears at $T$ much lower than the electroweak
phase transition temperature T_ew. This mechanism should exhibit itself at the
LHC experiments on heavy ion collisions. It operates at the one-loop diagram
level for an effective potential. The created fields are temperature dependent
and occupying the macroscopic volume of quark-gluon plasma. The magnetization
influences different processes and may serve as a signal for the DPT.
