Oxygen-Migration-Based Spintronic Device Emulating a Biological Synapse
Oxygen-Migration-Based Spintronic Device Emulating a Biological Synapse
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DOI：
10.1103/physrevapplied.11.054065
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发表时间：
2019-05-23
影响因子：
4.6
通讯作者：
Yang, Hyunsoo
中科院分区：
文献类型：
--
作者：
Mishra, Rahul;Kumar, Dushyant;Yang, Hyunsoo
生物突触是大脑的记忆和学习元素，对其进行电子仿真是实现类脑计算系统的重要一步。然而，由于功率和面积效率低下，基于互补金属氧化物半导体的突触实现不可扩展。因此，有必要开发替代材料和设备概念，以节能的方式模拟最大数量的突触功能。在这里，我们展示了一种纳米级节能三端人工突触，具有独立的读写路径，基于磁性材料（Co），可以产生正和负突触输出。 Co 磁化强度代表突触重量，通过使用电场将氧离子传输进出 Co 层，以节能的方式进行调制。展示了广泛的突触功能，例如突触增强和抑制、尖峰幅度、速率和时间依赖性可塑性，以及从短期可塑性到长期可塑性的转变。我们的结果表明自旋电子突触在神经形态计算中的可行性。
Electronic emulation of the biological synapse, which is the memory and learning element of the brain, is an important step towards the realization of brain-inspired computing systems. However, a complementary metal-oxide-semiconductor-based implementation of a synapse is not scalable due to the power and area inefficiency. It is therefore essential to develop alternative material and device concepts that can mimic the maximum number of synaptic functionalities in an energy-efficient way. Here, we demonstrate a nanosized energy-efficient three-terminal artificial synapse, with a separate read and write path, based on a magnetic material (Co) that could generate both positive and negative synaptic outputs. The Co magnetization, which is representative of the synaptic weight, is modulated in an energy-efficient way by using an electric field to transport oxygen ions in and out of the Co layer. A wide range of synaptic functions such as synaptic potentiation and depression, spike magnitude, rate, and timing-dependent plasticity, and the transition from short-term to long-term plasticity are demonstrated. Our results suggest the viability of a spintronic synapse in neuromorphic computing.