Microwave-induced supercurrent in a ferromagnetic Josephson junction

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Abstract:

We study the supercurrent resulting from coupling of the Josephson phase and the spin wave excited by microwave radiation in a ferromagnetic Josephson junction, in which two superconductors are separated by a ferromagnet. To explore how the spin-wave excitation affects the current–voltage curve, the resistively shunted junction model, which is an equation of motion for the Josephson phase, is extended by considering the gauge invariance including magnetization. When the magnetization is driven by the microwave adjusted to the ferromagnetic resonance frequency, the dc supercurrent is induced in the junction and the current–voltage curve shows step structures as a function of applied voltage. The position of each step in voltage is proportional to the microwave frequency multiplied by an even number. This means that the even number of magnons is necessary for the singlet Cooper pair to go through the ferromagnetic layer. The magnitudes of step height can be controlled by tuning the shape of the interface. Our results present a new route to observe the spin-wave excitation by the Josephson effect.

Document Type: Research Article

DOI: http://dx.doi.org/10.1088/0953-2048/24/2/024008

Publication date: February 1, 2011

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