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arXiv 1304.2602cond-mat.mtrl-sci
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Heusler合金Fe2Co1-xCrxSi的半金属性和各向异性磁电阻特性

Half-metallicity and anisotropy magnetoresistance properties of Heusler alloys Fe2Co1-xCrxSi

Y. Du, G. Z. Xu, E. K. Liu, G. J. Li, H. G. Zhang, S. Y. Yu, W. H. Wang, G. H. Wu

摘要:

本文通过第一性原理计算和各向异性磁电阻测量研究了Heusler合金Fe_2Co_(1-x)Cr_xSi的半金属性。研究发现,随着Cr含量x的增加,Fe_2Co_(1-x)Cr_xSi的费米能级从价带顶向导带底移动,当x=0.75时,得到了0.75 eV的大半金属带隙.在此基础上,我们成功地合成了一系列Heusler Fe_2Co_(1-x)Cr_xSi多晶薄带样品。X射线衍射结果表明,Fe_2Co_(1-x)Cr_xSi系列样品为有序度较高的纯相,饱和磁矩符合半金属Slater-Pauling规则。除了两个端元Fe_2CoSi和Fe_2CrSi外,Fe_2Co_(1-x)Cr_xSi(x=0.25,0.5,0.75)的各向异性磁电阻均为负值,表明它们是稳定的半金属铁磁体。

英文摘要:

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 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, 0.75) show a negative value suggesting they are stable half-metallic ferromagnets.

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