Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments
Nearly total spin polarization in La2/3Sr1/3MnO3 from tunneling experiments
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DOI：
10.1063/1.1534619
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发表时间：
2003-01-13
影响因子：
4
通讯作者：
Fert, A
中科院分区：
文献类型：
--
作者：
Bowen, M;Bibes, M;Fert, A
我们对La2/3Sr1/3MnO3/SrTiO3/La2/3Sr1/3MnO3磁隧道结进行了磁输运测量。在4 K时获得了大于1800%的磁阻比，由此我们推断电极的自旋极化至少为95%。这一结果强烈地强调了混合价锰的半金属性质，并证明了它们作为自旋分析仪的能力。磁电阻延伸到温度超过270k。我们认为这些改进可能是由于优化了氧化物异质结构的图案化过程。(C) 2003年美国物理研究所。
We have performed magnetotransport measurements on La2/3Sr1/3MnO3/SrTiO3/La2/3Sr1/3MnO3 magnetic tunnel junctions. A magnetoresistance ratio of more than 1800% is obtained at 4 K, from which we infer an electrode spin polarization of at least 95%. This result strongly underscores the half-metallic nature of mixed-valence manganites and demonstrates their capability as a spin analyzer. The magnetoresistance extends up to temperatures of more than 270 K. We argue that these improvements over most previous works may result from optimizing the patterning process for oxide heterostructures. (C) 2003 American Institute of Physics.