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000014822 084__ $$2WoS$$aPhysics, Condensed Matter
000014822 1001_ $$0P:(DE-Juel1)130799$$aLežaić, Marjana$$b0$$eCorresponding Author$$ufzj
000014822 245__ $$aComplex magnetic behavior and high spin polarization in Fe$_{3-x}$Mn$_{x}$Si alloys
000014822 260__ $$aCollege Park, Md.$$bAPS$$c2011
000014822 300__ $$a094434
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000014822 500__ $$aWe would like to thank the Supercomputing Center of the Forschungszentrum Julich (JSC) for providing computational time. This work was funded in part by the Young Investigators Group Programme of the Helmholtz Association "Computational Nanoferronics Laboratory," Contract No. VH-NG-409.
000014822 520__ $$aFe3Si is a ferromagnetic material with possible applications in magnetic tunnel junctions. When doped with Mn, the material shows a complex magnetic behavior, as suggested by older experiments. We employed the Korringa-Kohn-Rostoker Green-function method within density-functional theory in order to study the alloy Fe3-xMnxSi, with 0 <= x <= 1. Chemical disorder is described within the coherent potential approximation. In agreement with experiment, we find that the Mn atoms align ferromagnetically to the Fe atoms, and that the magnetization and Curie temperature drop with increasing Mn concentration x. The calculated spin polarization P at the Fermi level varies strongly with x, from P = -0.3 at x = 0 (ordered Fe3Si) through P = 0 at x = 0.28, to P = +1 for x > 0.75; i.e., at high Mn concentrations the system is half metallic. We discuss the origin of the trends of magnetic moments, exchange interactions, Curie temperature, and the spin polarization.
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000014822 7001_ $$0P:(DE-Juel1)130823$$aMavropoulos, Ph.$$b1$$uFZJ
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000014822 7001_ $$0P:(DE-HGF)0$$aEbert, Hubert$$b3
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