Stress-induced controllable magnetic properties in flexible epitaxial Mn0.5Zn0.5Fe2O4 ferrite films

Flexible ferrite film has high potential applications in electronic skins and wearable devices . However, it is an enormous challenge to fabricate flexible ferrite film because of its high fragility. This work uses a novel etching sacrificial Sr 3 Al 2 O 6 (SAO) layer to synthesize flexible Mn 0.5 Zn 0.5 Fe 2 O 4 (MZFO) ferrite film. The MZFO film remains its single crystal structure after being transferred onto a flexible substrate . Owing to the great lattice mismatch between SAO and MZFO, the as-grown and transferred MZFO films exhibit the difference in magnetic properties , which is more sensitive along out-of-plane direction. The controllable magnetic properties of the film under the bending test are characterized by ferromagnetic resonance (FMR). A huge FMR field ( H r ) shift of 704 Oe is achieved along out-of-plane direction when the bending radii are 5 mm. Meanwhile, the FMR linewidth ( δH ) of bent MZFO film (1267 Oe) is about 4 times higher than that of the unbent film (310 Oe). These controllable changes mainly come from the contribution of the two magnon scattering (TMS) effect. Finally, the H r and δH almost return to their initial states when the stress is released, indicating a great recoverability .