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    STUDIA PHYSICA - Ediţia nr.2 din 2011  
         
  Articol:   ENHANCED EXTRINSIC MAGNETORESISTANCE IN La0.8Pb0.2MnO3/Pb(Zr0.52Ti0.48)O3 CERAMIC COMPOSITES.

Autori:  I. BALASZ. 		 
       
         
  Rezumat:  We report the electrical and magnetic properties of the ferromagnet/ferroelectric-type composite 0.8La0.8Pb0.2MnO3 – 0.2Pb(Zr0.52Ti0.48)O3. The x-ray analysis indicated that the two component phases exist independently in the composite, without any sign of a new phase. Compared with pure La0.8Pb0.2MnO3 (LPMO), the magnetic measurements did not show significant changes in the Curie temperature (TC = 320 K), in the coercivity (Hc = 0.05 T, at 5 K) and in the magnetic moment (m = 3.56 μB/Mn), suggesting the absence of interdiffusion between the LPMO and Pb(Zr0.52Ti0.48)O3 (PZT) phases. Both the pure LPMO and the composite sample show magnetoresistance effect. The LPMO sample has a metal – insulator transition at a temperature close to Tp ~ 250 K were ρ(T) curve has a maximum. In composite, this maximum is replaced by a change of slope in the temperature dependence of resistivity at about 80 K, and ρ(T) curve indicates a semiconductor-like behavior. The highest magnetoresitance (MR) value in 7 T was found to increase from 48% for LPMO (at 8 K) to 76% for the composite (at 50 K). The magnetotransport properties of the composite were analyzed in a strain-mediated magnetoelectric coupling scenario, between the LPMO and PZT phases.

Keywords: Ferromagnetic–ferroelectric composite; Colossal magnetoresistance; Magnetoelectric coupling 

  
         
     
         
         
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