Half-metallicity and anisotropy magnetoresistance properties of Heusler alloys Fe₂Co_{1?yle='font-style: italic'>x}Cr_xSi

详细信息    查看全文

• 作者：Y. Du^a ; G.Z. Xu^a ; E.K. Liu^a ; G.J. Li^a ; H.G. Zhang^a ; S.Y. Yu^b ; W.H. Wang^a ; ^{wenhong.wang@aphy.iphy.ac.cn} ; G.H. Wu^a
• 关键词：Half-metallicity ; Heusler alloy ; Anisotropy magnetoresistance
• 刊名：Journal of Magnetism and Magnetic Materials
• 出版年：2013
• 出版时间：June, 2013
• 年：2013
• 卷：335
• 期：Complete
• 页码：101-104
• 全文大小：437 K

文摘

In this paper, we investigate the half-metallicity of Heusler alloys Fe₂Co_1?xCr_xSi by first principles calculations and anisotropy magnetoresistance measurements. It is found that, with the increase of Cr content x, the Fermi level of Fe₂Co_1?xCr_xSi 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 Fe₂Co_1?xCr_xSi polycrystalline ribbon samples. The results of X-ray diffraction indicate that the Fe₂Co_1?xCr_xSi 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 Fe₂Co_1?xCr_xSi (x=0.25, 0.5, and 0.75) shows a negative value suggesting they are stable half-metallic ferromagnets.