Giant magnetoresistance in ferromagnet/superconductor superlattices.
Giant magnetoresistance in ferromagnet/superconductor superlattices.
复制标题
DOI：
10.1103/physrevlett.94.057002
复制
发表时间：
2005-02
影响因子：
8.6
通讯作者：
V. Peña;Z. Sefrioui;D. Arias;C. León;J. Santamaria;J. Martinez;S. Velthuis;A. Hoffmann
中科院分区：
文献类型：
--
作者：
V. Peña;Z. Sefrioui;D. Arias;C. León;J. Santamaria;J. Martinez;S. Velthuis;A. Hoffmann
在含有高度自旋极化的La0.7Ca0.3MnO_3和高温超导YBa2Cu3O_7的三层膜中，磁阻超过1000%。这种大磁阻类似于金属超晶格中的巨磁电阻(GMR)，但其值要大得多，并且源于自旋极化载流子注入引起的自旋不平衡。此外，与普通巨磁电阻不同的是，磁阻与YBa2Cu3O7层的超导电性密切相关，在正常态下为零。这一结果，除了它的基本重要性，可能会对基于铁磁/超导结构的新型自旋电子器件的设计感兴趣。
We show magnetoresistance in excess of 1000% in trilayers containing highly spin-polarized La0.7Ca0.3MnO3 and high-Tc superconducting YBa2Cu3O7. This large magnetoresistance is reminiscent of the giant magnetoresistance (GMR) in metallic superlattices but with much larger values, and originates at spin imbalance due to the injection of spin-polarized carriers. Furthermore, in contrast to ordinary GMR, the magnetoresistance is intimately related to the superconductivity in the YBa2Cu3O7 layer and vanishes in the normal state. This result, aside from its fundamental importance, may be of interest for the design of novel spintronic devices based on ferromagnet/superconductor structures.