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Measured mutual inductances when the excitation frequency is 40 KHz and the lift-off is 5 mm. (a) Mutual inductance in the form of a real part and an imaginary part. (b) Mutual inductance in the form of amplitude and phase. Trajectories are drawn, where black denotes copper, green denotes aluminum, red denotes zinc, blue denotes tin and cyan denotes titanium. The characteristic phase for each metal is marked by a circle with the same color as the corresponding trajectory.
