Hybridization of Spin and Plasma Waves in Josephson Tunnel Junctions Containing a Ferromagnetic Layer

A. F. Volkov; K. B. Efetov

doi:10.1103/PhysRevLett.103.037003

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Hybridization of Spin and Plasma Waves in Josephson Tunnel Junctions Containing a Ferromagnetic Layer

A. F. Volkov, K. B. Efetov

DOI 10.1103/PhysRevLett.103.037003 · Physical Review Letters

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Abstract

We study dynamics of tunnel Josephson junctions with a thin ferromagnetic layer F [superconductor-insulator-ferromagnet-superconductor (SIFS) junctions]. On the basis of derived equations relating the superconducting phase and magnetic moment to each other we analyze collective excitations in the system and find a new mode which is a hybrid of plasmalike and spin waves. The latter are coupled together in a broad range of parameters characterizing the system. Using the solution describing the collective modes we demonstrate that besides the Fiske steps new peaks appear on the I−V characteristics due to oscillations of the magnetic moment M in the ferromagnetic layer. Thus, by measuring the I−V curve of the SIFS junctions, one can extract information about the spectrum of spin excitations in the ferromagnet F.