Structural and magnetic modifications in thin films feir superlattices caused by gamma radiation

الملخص EN

Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM), X-Ray Diffraction (XRD) and vibrating sample magnetometer (VSM) measurements were used to study the effect of 1.25 MeV y-rays irradiation on [Fe (18Å) /Ir (14 Å)] x75 thin film superlattice obtained by molecular beam epitaxy (MBE).

Modification of the morphology of the film, observed by SEM and AFM measurements, showed an increase of the roughness.

X-ray diffraction measurement detected a decrease of the relative intensity after irradiation indicating inter-diffusion between Fe and Ir, and particle size reduction.

VSM measurements indicated changes in the magnetic properties.

A decrease of remanence (MR) and a decrease of saturation magnetization (MS) for irradiated sample were observed.

The possible mechanisms attributed to such effects are analyzed in the text.

PACS : 75.70.Cn, 76.80.

+y, 61.10.Nz