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Origin of the magnetic moment enhancement of the ordered Fe 50 Co 50 alloys
Author(s) -
Park C. H.,
Kim I. G.,
Lee B. C.,
Lee J. I.
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304513
Subject(s) - magnetic moment , condensed matter physics , electron , alloy , moment (physics) , spin (aerodynamics) , spin magnetic moment , electron magnetic dipole moment , materials science , physics , magnetic field , spin polarization , magnetic dipole , thermodynamics , metallurgy , quantum mechanics
We investigated the physical origin of the magnetic moment enhancements of the ordered Fe 50 Co 50 alloys with B 2 and L 1 0 structures by using the all‐electron total‐energy full‐potential linearized augmented plane wave (FLAPW) method within the generalized gradient approximation. Pure Fe and Co with the Wigner‐Seitz radii taken from the alloys are also calculated for comparsion. It is confirmed that the magnetic moments of Fe in the alloys are enhanced significantly, while those of Co remain almost unchanged. The Fe magnetic moment enhancement in the alloy originates from “ spin–flipping ” of t 2 g electrons caused by the increase of the exchange splitting which makes the majority d electrons filled completely. In the case of the Co magnetic moment in the alloys, the spin‐up d band is already filled up in the pure phases, hence the magnetic moment stability against the alloy formation is preserved. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)