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Structural design of barium hexaferrites BaMg_xCo_{2-x}Fe_{16}O_{27} (x=0.0, 1, 2) has been studied, and the magnetic and electronic structure of that has then been investigated using first principle total energy calculation. All calculations are based on the density functional theory. In order to improve the description of strongly correlated 3d electrons of iron, the general gradient approximation...
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