On the mechanism of ferromagnetic resonance in ferromagnet-superconductor trilayers

The dataset consist of the data used to prepare the figures for the manuscript: Dariia Popadiuk, Julia Kharlan, Anatolii Kravets, Vladislav Korenivski, Jaroslaw W. Klos and Vladimir Golub "On the mechanism of ferromagnetic resonance in ferromagnet-superconductor trilayers". Abstract: Temperature dependent magnetic properties of superconductor–ferromagnet–superconductor(SC/FM/SC) trilayers are studied both experimentally and theoretically, with a focus on ferro-magnetic resonance (FMR). The influence of the SC and FM layer thicknesses on the FMR field isexamined. To differentiate the mechanisms involved, we additionally investigate structures contain-ing nonmagnetic metallic (M) or insulating (I) spacers (SC/FM/M/SC or SC/FM/I/SC). All thestudied multilayers show large reductions in the FMR field below the critical temperature of theSC, except the system containing an insulating spacer (SC/FM/I/SC). This SC-induced FMR-shift(resonance field/frequency) is larger for thicker SC as well as FM layers, reaching a saturation valuefor very large thicknesses. To explain the measured results, an analytical model is developed, inwhich the FM-magnetization precession modulates the magnetic flux in the system, thereby induc-ing an alternating supercurrent in the SC, which in turn produces a dynamic back-action magneticfield on the FM that shifts its resonance frequency. The model considers closed current loops, wherethe FM layer conductively links the supercurrents flowing in the opposite directions in the two outerSC layers. Our results provide a practical route for increasing the operating frequency of magnonicdevices. The dataset contains information for the reproduction Fig.2 from the manuscript. The files "Fig2a.txt", "Fig2b.txt" and "Fig2c.txt" contain the datasets for Fig. 2 (experimental temperature dependencies of the resonance field obtained using the ferromagnetic resonance technique). The file "Fig2a.txt" contains the data for samples S1–S6 for a fixed SC layer thickness of d_s = 50 nm and FM layer thicknesses of d_f = 10, 20, 50, 100, 200, and 500 nm. In these samples, the Nb and Py layers are in direct contact. The file consists of 12 rows: odd rows are temperatures T_df (for each value of d_f the exact number is specified), and even rows are the corresponding values of the resonance field Hr_df. The file "Fig2b.txt" contains the data for samples S3, S7, and S8 for a fixed FM layer thickness of d_f = 50 nm and SC layer thicknesses of d_s = 50, 100, and 200 nm. In these samples, the Nb and Py layers are also in direct contact. The file consists of 6 rows: odd rows are temperatures T_ds (for each value of d_s the exact number is specified), and even rows are the corresponding values of the resonance field Hr_ds. The file "Fig2c.txt" contains the data for samples S3, S9, and S10 for a fixed FM layer thickness of d_f = 50 nm and SC layer thickness of d_s = 50 nm with different one-side spacers between SC and FM. The file consists of 6 rows: odd rows are temperatures T_spacer (spacer = none, Ag, dielectric), and even rows are the corresponding values of the resonance field Hr_spacer.