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Magnanite multilayers have been fabricated using La0.67Ca0.33MnO3 as theferromagnetic layer and Pr0.7Ca0.3MnO3 and Nd0.5Ca0.5MnO3 as the spacer layers.All the multilayers were grown on LaAlO3 (100) by pulse laser deposition. Anenhanced magnetoresistnace (defined (RH- R0)/R0) of more than 98% is observedin these multilayers. Also a low field magnetoresistance of 41% at 5000 Oe isobserved in these multilayer films. The enhanced MR is attributed to theinduced double exchange in the spacer layer, which is giving rise to morenumber of conducting carriers. This is compared by replacing the spacer layerwith LaMnO3 where Mn exists only in 3+ state and no enhancement is observed inthe La0.67Ca0.33MnO3 / LaMnO3 multilayers as double exchange mechanism can notbe induced by external magnetic fields.Comment: 13 pages, 5 Figure

Enhancement of magnetoresistance in manganite multilayers