Nuclear spin dynamics and magnetic structure of nanosized particles of La0.7Sr0.3MnO3 -: art. no. 024413

Detailed studies of both Mn-55 NMR spectra and nuclear relaxation, completed by magnetic measurements, have been performed to obtain microscopic information on the magnetic structure of fine scale (similar to50 and similar to100-200 nm) particles of La0.7Sr0.3MnO3 prepared by the coprecipitation method. Measurements of the resistance and magnetoresistance have also been carried out to assist these data. Our results on nuclear spin dynamics provide direct evidence of previous statements that a grain boundary in magnetoresistive manganites is not a magnetically and electrically sharp interface but should be considered as a transfer region of several monolayers different from the grain's inner part magnetic and structure orders.