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    STUDIA PHYSICA - Issue no. 1 / 2009  
         
  Article:   STRUCTURAL BEHAVIOUR OF MNBI COMPOUND.

Authors:  MARIA-SIMONA GUTOIU, EUGEN DOROLTI, O. ISNARD, VIOREL POP, IONEL CHICINAŞ. 		 
       
         
  Abstract:  The scientific interest regarding MnBi hard magnetic phase results from the high magnetocrystalline anisotropy of low-temperature phase (LTP) and large Kerr rotation angle of quenched high temperature phase (QHTP). The MnBi phase was obtained by melting of elemental Mn and Bi components. The sample obtained after melting were annealed at different temperatures: 258 °C, 300 °C, 400 °C and 420 °C under vacuum (10-5 mbar). The X-ray patterns show a better cristallinity of the structure after annealing. In both as melt and annealed samples some quantity of free Bi phase was evidenced due to hard diffusion of the elemental components in MnBi matrix. The magnetic coercivity is reinforced by increasing the temperature and a value μ0H ≈ 2.5 T was obtained at 450 K for melted samples and subsequently milled for 2 h and annealed at 300 °C. In order to test the influence of milling on the MnBi phase stability, the as melted samples and the annealed samples were mechanically milled. The quantity of the unreacted Bi phase increases after milling.

Keywords: MnBi, hard magnetic phase, nanostructured magnetic materials 		 
         
     
         
         
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