Strong evidence for d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface.
Strong evidence for d-electron spin transport at room temperature at a LaAlO3/SrTiO3 interface.
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DOI：
10.1038/nmat4857
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发表时间：
2016-01
期刊：
影响因子：
41.2
通讯作者：
R. Ohshima;Y. Ando;K. Matsuzaki;T. Susaki;M. Weiler;S. Klingler;H. Huebl;E. Shikoh;T. Shinjo;S. Goennenwein;M. Shiraishi
中科院分区：
文献类型：
--
作者：
R. Ohshima;Y. Ando;K. Matsuzaki;T. Susaki;M. Weiler;S. Klingler;H. Huebl;E. Shikoh;T. Shinjo;S. Goennenwein;M. Shiraishi
正轨道电子具有各向异性的电子轨道，是磁性的来源。在LaAlO3/ srtio3界面上嵌入二维电子气体（2DEG）的实现让材料和物理科学领域的研究人员感到惊讶，因为2DEG由Ti的3d电子组成，即使在绝缘氧化物异质结构中也具有非常大的载流子迁移率。到目前为止，在2DEG系统中已经发现了各种各样的物理现象，如铁磁性和量子霍尔效应，这表明了d电子2DEG系统为有趣的物理研究提供了一个材料平台的能力。然而，由于铁磁性和Rashba场的双重作用，远程自旋输运和自旋电子学功能的开发一直被认为是实现非电子2DEG系统的困难。本文报道了在LaAlO3/ srtio3界面上，自旋弛豫长度约为300 nm的ad-电子基2DEG室温自旋输运的实验证明。我们的发现反驳了对d-电子2DEGs的传统理解，突出了导电氧化物体系的自旋功能，开辟了d-电子自旋电子学领域。
Ad-orbital electron has an anisotropic electron orbital and is a source of magnetism. The realization of a two-dimensional electron gas (2DEG) embedded at a LaAlO3/SrTiO3interface surprised researchers in materials and physical sciences because the 2DEG consists of 3d-electrons of Ti with extraordinarily large carrier mobility, even in the insulating oxide heterostructure. To date, a wide variety of physical phenomena, such as ferromagnetism and the quantum Hall effect, have been discovered in this 2DEG system, demonstrating the ability ofd-electron 2DEG systems to provide a material platform for the study of interesting physics. However, because of both ferromagnetism and the Rashba field, long-range spin transport and the exploitation of spintronics functions have been believed difficult to implement ind-electron 2DEG systems. Here, we report the experimental demonstration of room-temperature spin transport in ad-electron-based 2DEG at a LaAlO3/SrTiO3interface, where the spin relaxation length is about 300 nm. Our finding, which counters the conventional understandings ofd-electron 2DEGs, highlights the spin-functionality of conductive oxide systems and opens the field ofd-electron spintronics.