  The Hall effect that occurs when current flows through a CoFeB/MgO/Pt tunnel
junction is investigated. It is shown that the transverse voltage in Pt
electrode is nonlinear on a DC voltage applied to the tunnel junction. It has
both linear (odd) and quadratic (even) parts. The linear part contains
well-known contributions of the anomalous Hall effect in the ferromagnetic
electrode, inverse spin-hall effect in platinum and others. The quadratic part
is a phenomenon caused by the spin-orbit scattering of electrons in an external
electric field induced by a voltage applied to the barrier. This field reaches
values of $10^9$ V/m which is close to internal atomic fields. The magnitude of
both effects decreases as thickness of Pt electrode is increased due to
shunting effects.
