Thickness-dependent magnetic property of FeNi thin film grown on flexible graphene substrate

Electronics over flexible substrates represent advantages of flexibility, portability, and low cost, and promising applications in areas of energy, information, defense science and medical service. In recent years, tremendous progress has been witnessed in developing flexible wearable devices that can be potentially massively deployed. Of extreme interest to intelligent wearable devices, such as sensors and storage cells, can be integrated by the flexible magnetoelectronic devices based on magnetic thin films. In this regard, magnetic property of FeNi thin films with different thicknesses grown on flexible graphene substrate are investigated at room temperature. The coercivity increases with increasing thickness of FeNi thin film, which can be attributed to the increase of grain size and decrease of surface roughness. Moreover, the thickness modulated magnetic property shows magnetic anisotropy shift increase with varying thickness of FeNi thin film by using measurements based on ferromagnetic resonance, and further enhance the resonance frequency. In addition, the resonance peak is quite stable after bending it ten cycles. The result is promising for design of future flexible magnetoelectronic devices.