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    STUDIA PHYSICA - Issue no. 1 / 2007  
         
  Article:   SOFT MAGNETIC NANOCRYSTALLINE/NANOSTRUCTURED MATERIALS PRODUCED BY MECHANICAL ALLOYING ROUTES.

Authors:  I. CHICINAŞ. 		 
       
         
  Abstract:  Materials whose crystallites/particle sizes are smaller than 100 nm are commonly named nanocrystalline/nanostructured/nanosized materials. The unique properties of nanocrystalline materials are derived from their large number of atoms residing in defect environments (grain boundaries, interfaces, interphases, triple junctions) compared to coarse-grained polycrystalline counterparts [1-3]. The benefits found in the nanocrystalline alloys stem from their chemical and structural variations on a nanoscale, which are important for developing optimal magnetic properties [1,2,4]. It is well known that the microstructure, especially the crystallite size, essentially determines the hysteresis loop of the soft ferromagnetic materials. The reduction of crystallite size to the dimensions of the domain wall width increases the coercivity towards an extreme value controlled by the anisotropy [5]. However, the lowest coercivity is found again for crystallite smaller than the correlation lengths like in amorphous and nanocrystalline alloys. Such behaviour has been explained by the random anisotropy model [6].  
         
     
         
         
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