  We calculate the response of a ferromagnet - antiferromagnet junction to a
high-frequency magnetic field as a function of the spin-polarized current
through the junction. Conditions are choused under which the response is zero
in absence of such a current. It is shown that increasing in the current
density leads to proportional increase in the resonance frequency and resonant
absorption. A principal possibility is indicated of using ferromagnet -
antiferromagnet junction as a terahertz radiation detector.
