标题：Half-metallicity and anisotropy magnetoresistance properties of Heusler alloys Fe2Co1-xCrxSi
作者：Du, Y. ;Xu, G.Z. ;Liu, E.K. ;Li, G.J. ;Zhang, H.G. ;Yu, S.Y. ;Wang, W.H. ;Wu, G.H.
作者机构：[Du, Y. ;Xu, G.Z. ;Liu, E.K. ;Li, G.J. ;Zhang, H.G. ;Wang, W.H. ;Wu, G.H. ] Beijing National Laboratory for Condensed Matter Physics, Institute of Phy 更多
来源：Journal of Magnetism and Magnetic Materials
摘要：In this paper, we investigate the half-metallicity of Heusler alloys Fe2Co1-xCrxSi by first principles calculations and anisotropy magnetoresistance measurements. It is found that, with the increase of Cr content x, the Fermi level of Fe2Co1-xCrxSi moves from the top of valence band to the bottom of conduction band, and a large half-metallic band gap of 0.75 eV is obtained for x=0.75. We then successfully synthesized a series of Heusler Fe2Co1-xCrxSi polycrystalline ribbon samples. The results of X-ray diffraction indicate that the Fe2Co1-xCrxSi series of samples are pure phase with a high degree of order and the saturation magnetic moment follows half-metallic Slater-Pauling rule. Except for the two end members, Fe2CoSi and Fe2CrSi, the anisotropic magnetoresistance of Fe2Co1-xCrxSi (x=0.25, 0.5, and 0.75) shows a negative value suggesting they are stable half-metallic ferromagnets. © 2013 Elsevier B.V.