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yexuqing木虫之王 (文学泰斗)
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Picosecond ultralow-power switching device based on an antiferromagnet
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Picosecond ultralow-power switching device based on an antiferromagnet 基于反铁磁体的皮秒超低功耗开关器件 ▲ 作者：HANSHEN TSAI, TAKUYA MATSUDA, KOUTA KONDOU, KOTARO SHIMIZU, TAKUYA NOMOTO, TOMOYA HIGO, ET AL. ▲链接： https://www.science.org/doi/10.1126/science.adt3136 ▲摘要：开发一种超快、高能效的非易失性开关器件将对新兴计算架构产生重要影响。然而，当前处理速度已停滞在纳秒级，进一步加速需要极大的写入功率。 研究组利用反铁磁体Mn3Sn与重金属钽构成的异质结构，通过短至40皮秒的电脉冲实现了自旋轨道矩开关。由于高效的角动量转移，其在皮秒时间尺度上的功耗比铁磁同类器件低数个数量级。 与先前报道的皮秒开关器件相比，该超低功耗开关器件显著降低了发热，具有更高的耐久性，并能够利用光电流进行开关。这些结果为超快非易失性存储器和高效光电转换技术奠定了基础。 ▲ Abstract：Developing an ultrafast and energy-efficient nonvolatile switching device may pose a strong impact on emerging computing architectures. However, processing speed has plateaued in the nanosecond regime, as further acceleration demands excessively large write power. We demonstrate ultralow power in picosecond switching using heterostructures of the antiferromagnet Mn3Sn and heavy metal tantalum, which exhibit spin-orbit torque switching by electrical pulses as short as 40 picoseconds. Power consumption in the picosecond regime is several orders of magnitude lower than in ferromagnetic counterparts owing to efficient angular momentum transfer. Compared with previously reported picosecond switching devices, our ultralow-power switching device realizes much less heating, higher endurance, and switching using photocurrent. These results pave the way to ultrafast nonvolatile memory and efficient optical-to-electrical conversion technology. |
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