  Thermoelectric manipulation of the magnetization of a magnetic layered stack
in which a low-Curie temperature magnet is sandwiched between two strong
magnets (exchange spring device) is considered. Controllable Joule heating
produced by a current flowing in the plane of the magnetic stack (CIP
configuration) induces a spatial magnetic and thermal structure along the
current flow --- a magneto-thermal-electric domain (soliton). We show that such
a structure can experience oscillatory in time dynamics if the magnetic stack
is incorporated into an electric circuit in series with an inductor. The
excitation of these magneto-thermionic oscillations follow the scenario either
of "soft" of "hard" instability: in the latter case oscillations arise if the
initial perturbation is large enough. The frequency of the temporal
oscillations is of the order of $10^5 \div 10^7 s^{-1}$ for current densities
$j\sim 10^6 \div 10^7 A/cm^3$.
