Magnetic viscosity of granular Fe films prepared by laser ablation

We have prepared granular Fe thin films by means of an ablation device work ing under Ar atmosphere. AFM images of the as-depoited films revealed a ste ady increase (from 13 up to 25 nm) of the average particle size associated to the increase of the deposition time. The relaxation behaviour of the sam ples showed that the magnetic viscosity was close to independent of the mea suring demagnetizing held in a broad held range, which can be interpreted i n terms of the occurrence of interparticle interactions. (C) 1999 Elsevier Science B.V. All rights reserved.