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arXiv 1111.6352cond-mat.mes-hall
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多层边缘分子自旋电子学器件的室温电流抑制

Room temperature current suppression on multilayer edge molecular spintronics device

Pawan Tyagi

摘要:

两个铁磁电极之间的分子传导通道可以产生强交换耦合,对自旋输运产生显著影响,从而使新型逻辑和存储器件的实现成为可能。然而,分子自旋电子学器件的制造是极具挑战性的,抑制了有见地的实验研究。最近,我们通过将有机金属分子团簇(OMC)桥接在磁性隧道结(MTJ)的约2 nm厚的绝缘体上,沿着其暴露的侧边,制备了多层边缘分子自旋电子器件(MEMSD)。这些MEMSDs表现出前所未有的铁磁薄膜之间的交换耦合和自旋输运的巨大变化的增加。本文重点研究了MEMS器件在室温下所表现出的电流抑制现象。在电流抑制的情况下,与MTJ测试床的漏电流水平相比,有效MEESD的电流减少多达六个数量级。在抑制电流状态下,温度、光辐射和磁场会影响MEMSD的输运。在抑制电流状态下,MEMSD也表现出光伏效应。这项研究激发了对涉及MTJ和有前途的磁性分子(如单分子磁体和卟啉)的其他组合的MEMSD的研究。对类似系统的电流抑制的观察将明确地建立MEMSD方法的实用性。

英文摘要:

Molecular conduction channels between two ferromagnetic electrodes can produce strong exchange coupling and dramatic effect on the spin transport, thus enabling the realization of novel logic and memory devices. However, fabrication of molecular spintronics devices is extremely challenging and inhibits the insightful experimental studies. Recently, we produced Multilayer Edge Molecular Spintronics Devices (MEMSDs) by bridging the organometallic molecular clusters (OMCs) across a ~2 nm thick insulator of a magnetic tunnel junction (MTJ), along its exposed side edges. These MEMSDs exhibited unprecedented increase in exchange coupling between ferromagnetic films and dramatic changes in the spin transport. This paper focuses on the dramatic current suppression phenomenon exhibited by MEMSDs at room temperature. In the event of current suppression, the effective MEMESDs' current reduced by as much as six orders in magnitude as compared to the leakage current level of a MTJ test bed. In the suppressed current state, MEMSD's transport could be affected by the temperature, light radiation, and magnetic field. In the suppressed current state MEMSD also showed photovoltaic effect. This study motivates the investigation of MEMSDs involving other combinations of MTJs and promising magnetic molecules like single molecular magnets and porphyrin. Observation of current suppression on similar systems will unequivocally establish the utility of MEMSD approach.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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