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    STUDIA PHYSICA - Ediţia nr.2 din 2006  
         
  Articol:   MAGNETISM AND X-RAY PHOTOELECTRON SPECTROSCOPY OF ALNI1-XMNX ALLOYS.

Autori:  V. REDNIC, R. PACURARIU, L. REDNIC, V. POP, M. NEUMANN, M. COLDEA. 		 
       
         
  Rezumat:  The electronic and magnetic properties of the two alloys AlNi0.4Mn0.6 and AlNi0.5Mn0.5 belonging to AlNi1-xMnx system, obtained from X–ray photoelectron spectroscopy and magnetic measurements, are reported. The most important feature of the XPS spectra is the well-defined magnetic exchange splitting of about 5 eV of the Mn 3s core levels of both alloys, arising from the exchange interactions between the core hole and open 3d shell. This gives a clear evidence of the existence of local moments in the Anderson’s sense, confined on Mn sites in these alloys. For both alloys the Mn and Ni 3d bands are filled more than half, which leads to a ferromagnetic coupling between the neighbouring local magnetic moments situated at Mn and Ni sites. By correlating the information from the XPS core levels spectra and magnetic measurements in the ordered and paramagnetic states, the magnetic behaviour of AlNi0.4Mn0.6 and AlNi0.5Mn0.5 can not be explained in the picture of ferromagnetic systems with a collinear arrangement of the local magnetic moments. We propose a canted ferromagnetism in the two alloys, which should be verified by further neutron diffraction investigations.  
         
     
         
         
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