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Published on: March 24, 2019
Excitation of spin waves in superconducting ferromagnets
1The Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
Abstract:
This Letter presents a theoretical analysis of propagation of spin waves in a superconducting ferromagnet. The surface impedance was calculated for the case when the magnetization is normal to the sample surface. We found the frequencies at which the impedance and the power absorption have singularities related to the spin-wave propagation, and determined the form of these singularities. With a suitable choice of parameters, there is a frequency interval in which two propagating spin waves of the same circular polarization are generated, one of them having a negative group velocity.
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