  We report the results of a study of magnetic field features of electron
transport in heterojunctions with NS boundary inside iron-based
superconductors, represented by a binary phase of $\alpha$ - FeSe and
oxyarsenide pnictide LaO(F)FeAs. We used the ability of self magnetic field of
the transport current to partially destroy superconductivity, no matter how low
the field may be, in the NS interface area, where, due to the proximity effect,
the superconducting order parameter, $\Delta$, disperses from 1 to 0 within the
scale of the Ginzburg-Landau coherence length. The following features of
transport were found:(i) at $T<T_{c}$, magnetoresistance in systems with
different superconductors has different sign;(ii) sign and magnitude of the
magnetoresistance depend on the magnitude of current and temperature, and (iii)
in all operating modes where the contribution from Andreev reflection is
suppressed ($(T + eV) \gtrsim \Delta$),the hysteresis of the magnetoresistance
is present. Based on the results of the experiment and analysis it has been
concluded that there is along-range magnetic order in th eground normal state
of the iron-based superconductors studied, in the presence of itinerant
magnetism of conduction electrons which determines the possibility of
anisotropic spin-dependent exchange interaction with the local magnetic moments
of the ions.
