La2/3Sr1/3MnO3-La0.1Bi0.9MnO3 heterostructures for spin filtering

被引：35

作者：

Gajek, M.

Bibes, M.

Varela, M.

Fontcuberta, J.

Herranz, G.

Fusil, S.

Bouzehouane, K.

Barthelemy, A.

Fert, A.

机构：

[1] CSIC, ICMAB, Bellaterra 08193, Spain

[2] CNRS Thales, Unite Mixte Phys, F-91767 Palaiseau, France

[3] Univ Paris 11, Inst Elect Fondamentale, F-91405 Orsay, France

[4] Univ Barcelona, Dept Fis Aplicada & Opt, E-08028 Barcelona, Spain

来源：

JOURNAL OF APPLIED PHYSICS | 2006年 / 99卷 / 08期

关键词：

D O I：

10.1063/1.2162048

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have grown heterostructures associating half-metallic La2/3Sr1/3MnO3 (LSMO) bottom electrodes and ferromagnetic La0.1Bi0.9MnO3 (LBMO) tunnel barriers. The layers in the heterostructures have good structural properties and top LBMO films (4 nm thick) have a very low roughness when deposited onto LSMO/SrTiO3(1.6 nm) templates. The LBMO films show an insulating behavior and a ferromagnetic character that are both preserved down to very low thicknesses. They are thus suitable for being used as tunnel barriers. Spin-dependent transport measurements performed on tunnel junctions defined from LSMO/SrTiO3/LBMO/Au samples show a magnetoresistance of up to similar to 90% at low temperature and bias. This evidences a spin-filtering effect by the LBMO layer, with a spin-filtering efficiency of similar to 35%. (C) 2006 American Institute of Physics.

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