Magnon-induced transparency of a disordered antiferromagnetic Josephson junction

A. G. Mal'shukov

doi:10.1103/4h7s-pjwj

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Magnon-induced transparency of a disordered antiferromagnetic Josephson junction

A. G. Mal'shukov

DOI 10.1103/4h7s-pjwj · Physical Review B

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Abstract

We considered a planar Josephson junction which is composed of two s-wave superconducting contacts deposited on the top of a thin antiferromagnetic (AFM) disordered metal film. In such a system, noticeable Josephson currents may be observed if contacts are just nanometers away from each other. It is shown that the excitation of AFM by magnons results in a strong enhancement of the stationary current through much longer junctions, whose length may be comparable to the coherence length of superconducting correlations in a nonmagnetic metal. Such a current is calculated at the weak tunneling amplitude of electrons between superconducting contacts and AFM. The problem is considered for nonequilibrium Green functions in the second-order perturbation theory with respect to the electron-magnon interaction. A spin-orbit torque oscillator was taken as a possible source of long-wavelength classic magnetic waves. This work predicts a strong effect of magnons on superconducting proximity effect in AFM, with promising applications in superconducting spintronics.