The following datasets include the experimental data used to produce figure 2 and 3:
raw_data_Fig2
raw_data_Fig3

Files are in CSV format and are self-explanatory.

The data in raw_data_Fig2 have been acquired by measuring the frequency of the mode with a spectrum analyzer for different current applied at the given coil (current can be derived as dc voltage on given resistance)

The data in raw_data_Fig3 have been acquired with a lock-in amplifier Stanford Research SR830 by sweeping amplitude and frequency of an ac drive current sent through coil 1 via the given resistance