Emergent Magneto-Inductance Effect in Ni45Fe55 Thin Films on Polycarbonate Substrates

We fabricate Ni
45
Fe
55
thin films on polycarbonate (PC) substrates by using thermal evaporation and investigate their structural and magnetic properties. Atomic force microscopy reveals that the surface roughness is small at 0.96 nm in Ni
45
Fe
55
thin films on PC substrates. Magneto-optical Kerr effect measurements indicate that Ni
45
Fe
55
thin films on PC substrates are magnetically soft. In the Ni
45
Fe
55
thin films on PC substrates, we have successfully observed the emergent magneto-inductance (ML) effect at room temperature. The ML ratio increases at lower frequencies, and it reaches 218% at 2 kHz. The observed emergent ML effect can be explained by spin motive force originating from the motion of domain walls under a stepwise external magnetic field.