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    STUDIA PHYSICA - Ediţia nr.1-2 din 2022  
         
  Articol:   MAGNETIC PROPERTIES OF (Fe,Co)5SiB2 ALLOYS BY W DOPING.

Autori:  R. HIRIAN, V. POP, O. ISNARD, D. BENEA. 		 
       
         
  Rezumat:  
DOI: 10.24193/subbphys.2022.03

Published Online: 2022-12-30
Published Print: 2022-12-30
pp. 25-33

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Abstract: The intrinsic magnetic properties (magnetic moments, magneto-crystalline anisotropy, Curie temperatures) of the Fe5-x-yCoyWxSiB2 alloys have been calculated using the spin-polarized relativistic Korringa-Kohn-Rostoker (SPRKKR) band structure method. Our calculations show that for several compounds with x ≥0.5, the magnetocrystalline anisotropy energy (MAE) became axial. Also, theoretical calculations for Fe4WSiB2 compound found a magnetization decrease (with about 20%), a Curie temperature decrease of about 30% but an increased axial magnetocrystalline anisotropy compared with the corresponding values for Fe5SiB2. Several Fe5-xWxSiB2 alloys (x = 0, 0.1, 0.2, 0.5, 1) have been prepared by arc melting of corresponding high purity elements in Ar controlled atmosphere. Composition analysis of the Fe5-xWxSiB2 alloys found an impurity phase along with the tetragonal I4/mcm phase of pure Fe5SiB2. The magnetic measurements found the decrease of the magnetization any significant increase of the coercivity due to W doping.

Keywords: ab-initio calculations, B. magneto-crystalline anisotropy, C. magnetization, D. rare earth free magnets. 		 
         
     
         
         
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