Composite excitation of Josephson phase and spin waves in Josephson junctions with ferromagnetic insulator
Abstract
Coupling of Josephson-phase and spin-waves is theoretically studied in a superconductor/ferromagnetic insulator/superconductor (S/FI/S) junction. Electromagnetic (EM) field inside the junction and the Josephson current coupled with spin-waves in FI are calculated by combining Maxwell and Landau-Lifshitz-Gilbert equations. In the S/FI/S junction, it is found that the current-voltage (I-V) characteristic shows two resonant peaks. Voltages at the resonant peaks are obtained as a function of the normal modes of EM field, which indicates a composite excitation of the EM field and spin-waves in the S/FI/S junction. We also examine another type of junction, in which a nonmagnetic insulator (I) is located at one of interfaces between S and FI. In such a S/I/FI/S junction, three resonant peaks appear in the I-V curve, since the Josephson-phase couples to the EM field in the I layer.
Keywords
Cite
@article{arxiv.1009.3551,
title = {Composite excitation of Josephson phase and spin waves in Josephson junctions with ferromagnetic insulator},
author = {S. Hikino and M. Mori and S. Takahashi and S. Maekawa},
journal= {arXiv preprint arXiv:1009.3551},
year = {2015}
}
Comments
16 pages, 5 figures