Room-temperature generation of giant pure spin currents using epitaxial Co2FeSi spin injectors
Room-temperature generation of giant pure spin currents using epitaxial Co2FeSi spin injectors
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DOI：
10.1038/am.2012.16
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发表时间：
2012-03-01
影响因子：
9.7
通讯作者：
Hamaya, Kohei
中科院分区：
文献类型：
--
作者：
Kimura, Takashi;Hashimoto, Naoki;Hamaya, Kohei
纯自旋流（即，没有充电电流的自旋角动量的流动）是用于实现具有超低电功率消耗的下一代自旋电子器件的有前景的方法。传统的铁磁电极，如Co和NiFe已被用作自旋注入器，以产生纯自旋电流在超导沟道。然而，纯自旋电流的产生效率在室温下是非常低的，给器件应用带来了严重的障碍。在这里，我们展示了巨大的纯自旋电流的产生在室温下在横向自旋阀设备与高度有序的Heusler化合物Co2 FeSi（CFS）的自旋注入器。CFS自旋注入器的纯自旋电流的产生效率是NiFe注入器的10倍，表明具有高自旋极化的Heusler化合物自旋注入器使我们能够实现高性能的横向自旋器件。本研究是自旋电子学的一个技术飞跃，表明具有半金属性的铁磁Heusler化合物在产生纯自旋电流方面具有巨大的潜力。NPG Asia Materials（2012）0，e9; doi：10.1038/am.2012.16; 2012年3月9日在线发布
The generation, manipulation and detection of a pure spin current (i.e., the flow of spin angular momentum without a charge current) are prospective approaches for realizing next-generation spintronic devices with ultra-low electric power consumption. Conventional ferromagnetic electrodes such as Co and NiFe have been utilized as spin injectors to generate pure spin currents in nonmagnetic channels. However, the generation efficiency of pure spin currents is extremely low at room temperature, giving rise to a serious obstacle for device applications. Here we demonstrate the generation of giant pure spin currents at room temperature in lateral spin valve devices with a highly ordered Heusler-compound Co2FeSi (CFS) spin injector. The generation efficiency of pure spin currents from the CFS spin injectors is 10 times greater than that of the NiFe injectors, indicating that Heusler compound spin injectors with high spin polarization enable us to materialize a high-performance lateral spin device. The present study is a technological jump in spintronics, and indicates the great potential of ferromagnetic Heusler compounds with half metallicity for generating pure spin currents. NPG Asia Materials (2012) 0, e9; doi:10.1038/am.2012.16; published online 9 March 2012