Retraction: "Φ memristor: Real memristor found" [J. Appl. Phys. 125, 054504 (2019)].

The authors apply a dynamic rotational model (a magnetic moment in a uniaxial anisotropy under the action of a magnetic field parallel to the anisotropy axis) that was found to account for the fast (microseconds timescale) reversal of a ferrite core that occurs under the application of a step-wise excitation, resulting in Eqs. The authors assume that such results obtained for a step-wise excitation are applicable to predict the response voltage [and I m i ( I t i )] to an arbitrary magnetic excitation, leading to Eqs. Equation (12), therefore, provides invalid results I v i (t), and thus I v i (i), when applied to a continuously varying excitation (the sinusoidal excitation is an example). [Extracted from the article]