Emergent magneto-inductance effect in NiFe thin films on glass substrates at room temperature

• Large emergent magneto-inductance (EML) is observed in Ni80Fe20 thin films on glass. • EML is enhanced by decreasing the cross-sectional area of Ni80Fe20 thin films. • Frequency response of EML in Ni80Fe20/glass exhibits a Debye-type relaxation property. • EML can be explained by calculation based on the transient domain-wall motion. • EML can be a powerful tool for potential applications in magnetic sensors. We investigate an emergent magneto-inductance (EML) effect using stepwise magnetic field with AC current in Ni 80 Fe 20 and Ni 36 Fe 64 thin films on glass substrates. The properties of the EML effect were evaluated in terms of frequency, stepwise magnetic field, cross-sectional area, and the proportion of Ni and Fe. As a result, a large EML (>1.5 μH) is observed under a low magnetic field of 10 Oe in Ni 80 Fe 20 thin films at room temperature. The EML effect can be enhanced by increasing the stepwise magnetic field increment or decreasing the cross-sectional area of Ni 80 Fe 20 thin films. Ni 80 Fe 20 /glass exhibits a larger EML effect compared to that of Ni 36 Fe 64 /glass, indicating that the EML depends on the strength of induced magnetic anisotropy. The observed EML effect can be explained by theoretical calculation based on the spin motive force owing to the transient current-driven domain-wall motion. These experimental and theoretical findings provide a deeper understanding on the mechanism of EML effect, and pave the way for potential applications, such as miniaturized inductors and magnetic sensors.