  A concept of an electrically tunable resonance detector of THz-frequency
signals based on antiferromagnetic/heavy metal (AFM/HM) hetero-structure is
proposed. The conversion of a THz-frequency input signal into DC voltage is
done using the inverse spin Hall effect in an (AFM/HM) bilayer. An additional
bias DC current in the HM layer can be used to vary the effective anisotropy of
the AFM, and, therefore, to tune the AFMR frequency. The proposed AFM/HM
hetero-structure works as a resonance-type quadratic detector which can be
tuned by the bias current in the range of at least 10 percent of the AFMR
frequency and our estimations show that the sensitivity of this detector could
be comparable to that of modern detectors based on the Schottky, Gunn or
graphene-based diodes.
