The STUDIA UNIVERSITATIS BABEŞ-BOLYAI issue article summary

The summary of the selected article appears at the bottom of the page. In order to get back to the contents of the issue this article belongs to you have to access the link from the title. In order to see all the articles of the archive which have as author/co-author one of the authors mentioned below, you have to access the link from the author's name.

 
       
         
    STUDIA PHYSICA - Issue no. 2 / 2011  
         
  Article:   ENHANCED EXTRINSIC MAGNETORESISTANCE IN La0.8Pb0.2MnO3/Pb(Zr0.52Ti0.48)O3 CERAMIC COMPOSITES.

Authors:  I. BALASZ.
 
       
         
  Abstract:  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 

 
         
     
         
         
      Back to previous page