Investigation on the dielectric response of NdMnO3/LSAT thin films: Effect of 200 MeV Ag+15 ion irradiation

We report the results of the modifications in structural and dielectric behaviour of pulsed laser deposited NdMnO 3 manganite thin films grown on (1 0 0) single crystalline (LaAlO 3 ) 0.3 (Sr 2 AlTaO 6 ) 0.7 substrate irradiated with the 200 MeV Ag +15 ion irradiation having different fluences, ∼5 × 10 10 , ∼5 × 10 11 , ∼5 × 10 12 ions/cm 2 . Structural strain was quantified using analysis of X-ray Diffraction data while Rutherford Backscattering measurements were performed on pristine NdMnO 3 film to confirm the elemental composition, thickness and oxygen content. Dielectric measurements performed on all the irradiated films show that, the dielectric constant decreases with increase in ion fluence which has been correlated with the irradiation induced increase in strain at the film-substrate interface. The dielectric relaxation behaviour of pristine and irradiated NdMnO 3 films have been understood by fitting the dielectric data using the Cole–Cole plots.