Highly ordered, half-metallic Co2FeSi single crystals

被引：48

作者：

Blum, C. G. F. ^{[1
,2
]}

Jenkins, C. A. ^{[1
]}

Barth, J. ^{[1
]}

Felser, C. ^{[1
]}

Wurmehl, S. ^{[2
]}

Friemel, G. ^{[2
]}

Hess, C. ^{[2
]}

Behr, G. ^{[2
]}

Buechner, B. ^{[2
]}

Reller, A. ^{[3
]}

Riegg, S. ^{[3
]}

Ebbinghaus, S. G. ^{[4
]}

Ellis, T. ^{[5
]}

Jacobs, P. J. ^{[5
]}

Kohlhepp, J. T. ^{[5
]}

Swagten, H. J. M. ^{[5
]}

机构：

[1] Johannes Gutenberg Univ Mainz, D-55099 Mainz, Germany

[2] IFW Dresden, Inst Solid State Res, D-01171 Dresden, Germany

[3] Univ Augsburg, D-86159 Augsburg, Germany

[4] Univ Halle Wittenberg, Inst Chem, D-06120 Halle, Germany

[5] Eindhoven Univ Technol, NL-5600 MB Eindhoven, Netherlands

来源：

APPLIED PHYSICS LETTERS | 2009年 / 95卷 / 16期

关键词：

TUNNEL MAGNETORESISTANCE; TRANSPORT-PROPERTIES; MAGNETIC-PROPERTIES; HEUSLER ALLOYS; CO2MNSI; FERROMAGNETS; COMPOUND; FILMS;

D O I：

10.1063/1.3242370

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A wide variety of properties such as half-metallicity is found among Heusler compounds. In order to separate intrinsic and extrinsic properties, high quality single crystals are required. Here, we report on differently grown crystals of the half-metallic ferromagnet Co2FeSi. All crystals show excellent ordering, resulting in outstanding electrical behavior with low residual resistivity and high residual-resistivity-ratio. All Co2FeSi crystals show a plateau in the resistivity below 50 K, which might point to half-metallic ferromagnetism. The cross-over from this unusual to more conventional transport (T-2 dependence) around 50 K indicates the onset of spin flip scattering and thus is indispensable for understanding the strong temperature dependence of Co2FeSi tunneling magnetoresistance-devices. (C) 2009 American Institute of Physics. [doi: 10.1063/1.3242370]

引用

页数：3

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