The magnetic response of surface plasmon polaritons (SPPs) has the potential to be utilized as a magnetic sensor. To this end, a non-solid solution material (Ag-Co system) was selected for evaluation, as such materials are expected to efficiently excite the SPPs, while also highly increasing the magnetic sensitivity with a single layer. In the Ag-Co non-solid solution film, Ag is a good SPP excitation material, whereas Co is a ferromagnetic material. The excitation and magnetic response of the SPPs in Ag-Co single layer films were investigated by varying the film thickness and wavelength, from which it was found that the optimal characteristics for both were obtained with films 35-50 nm thick. The largest magnetic response of the SPPs, as defined by the ratio of reflectivity change under the applied magnetic field between zero and 400 mT, was determined as ~0.29. The Ag-Co non-solid solution system therefore represents a good material for obtaining a large magnetic response of SPPs.
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