Microwave surface impedance of proximity-coupled superconducting (Nb) / spin-glass (CuMn) bilayers

Abstract

The surface impedance of Nb/CuMn (superconducting/spin-glass) bilayers has been measured at 10 GHz with the parallel plate resonator technique to obtain information about the exotic behavior of the order parameter in superconducting/magnetic proximity systems. The data strongly differs from the superconducting/normal-metal case, showing the magnetic nature of the CuMn layer, which acts as a weak ferromagnet. The results are described in the framework of two models for the electrodynamics of superconducting/ferromagnetic (S/M) bilayers characterized by a proximity-coupling length scale which is independent of temperature.

22 pages, 6 ps figures. Accepted for publication in Phys. Rev. B

References in corpus (1)

• Measurement of Resonant Frequency and Quality Factor of Microwave Resonators: Comparison of Methods

Cited by in corpus (4)

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• Irreversibility Line in Nb/CuMn Multilayers with a Regular Array of Antidots
• Microwave Electrodynamics of the Antiferromagnetic Superconductor GdBa_2Cu_3O_{7-δ}