Effect of 200Â MeV Ag ion irradiation on pink noise and magneto-transport properties of La0.7Ce0.3MnO3 thin films

Pulsed laser deposited thin films of electron doped La0.7Ce0.3MnO3 have been irradiated with 200 MeV Ag ions at different fluence values. The irradiation driven alteration on the pink noise (1/f noise), electrical and magneto-transport properties have been investigated. It is observed that the irradiation fluence adjusts the metal-insulator transition temperature, the magnetic field response to the resistance and the noise values. These parameters may assist in tuning these materials for applications. The film irradiated with the lower fluence value of 5 × 1010 ions/cm2 enhances the performance at room temperature. However, the film irradiated at higher fluence values manipulates these functionalities at lower temperature regime. The normalized noise values in the irradiated films are higher in ferromagnetic regime than in the paramagnetic regime. The observations have been explained on the basis of effects of the presence of swift heavy ion irradiation induced strain and defects.