2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/149350Spontaneous magnetization in the Maxwell QED$_{2+1}$ at finite fermion density is studied. It is shown that at low fermion densities the one-loop free energy has its minimum at some nonvanishing value of the magnetic field. The magnetization is due to the asymmetry of the fermion spectrum of the massive QED$_{2+1}$ in an external magnetic field.5 pages + 2 LaTeX figures, minor correctionsHigh Energy Physics - TheoryCondensed Mattertext