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Using the spin-polarized relativistic Korringa-Kohn-Rostoker method, we study the exchange interactions and Curie temperatures of Fe2 NiZ (Z= Al, Ga, Si, Ge) with the Hg2 CuTi structure. The Heisenberg exchange coupling parameters and Curie temperatures are obtained by calculating the exchange interactions between the constituents. It is found the nearest neighbor exchanges play a leading role in...
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