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Properties are discussed of a ferromagnetic junction of the type "rodcontacting with film". Very high current density of the order of $10^9$A/cm$^2$ may be achieved in the contact region. We show it can lead toinversion of population of the spin energy subbands. Spin injection dependsstrongly on the direction of the current (forward or backward). We preparedexperimentally a rod-to-film structure and investigated high density currentflowing through it. Current dependent radiation has been observed by means of aTHz receiver. In particular, the radiation becomes different for forward andbackward currents. It shows the radiation includes not only heating but alsonon-thermal (spin-injection) effects.

Spin-polarized current in ferromagnetic rod-to-film structure