Confined crystals of the smallest phase-change material.
Confined crystals of the smallest phase-change material.
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DOI：
10.1021/nl4010354
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发表时间：
2013-09-11
期刊：
影响因子：
10.8
通讯作者：
Silva SR
中科院分区：
文献类型：
--
作者：
Giusca CE;Stolojan V;Sloan J;Börrnert F;Shiozawa H;Sader K;Rümmeli MH;Büchner B;Silva SR
对高密度存储器的需求与当前存储设备的最小特征尺寸所施加的限制相结合，已经产生了对能够以比当前可能的更小的体积存储信息的新材料的需求。相变材料在商业光学数据存储产品中的成功应用，已经确定用于开发下一代电子存储器，所述相变材料在经受加热或冷却时可以可逆地且快速地从非晶相变为晶相。由于当前的合成和理论考虑，这些器件的小型化存在限制，这些理论考虑对最小位尺寸设置了2nm的下限，低于该下限，材料在结构相中不会发生转变。我们在这里表明，通过使用碳纳米管的直径小于2纳米的模板相变纳米线限制到他们的最小的可想象的规模。与先前的实验证据和理论预期相反，纳米线被发现在这种尺度下结晶，并显示非晶到结晶的相变，实现了存储元件的重要先决条件。我们展示了最小相变材料的证据，从而扩展了尺寸限制，以探索极端尺度下的相变存储器件。
The demand for high-density memory in tandem with limitations imposed by the minimum feature size of current storage devices has created a need for new materials that can store information in smaller volumes than currently possible. Successfully employed in commercial optical data storage products, phase-change materials, that can reversibly and rapidly change from an amorphous phase to a crystalline phase when subject to heating or cooling have been identified for the development of the next generation electronic memories. There are limitations to the miniaturization of these devices due to current synthesis and theoretical considerations that place a lower limit of 2 nm on the minimum bit size, below which the material does not transform in the structural phase. We show here that by using carbon nanotubes of less than 2 nm diameter as templates phase-change nanowires confined to their smallest conceivable scale are obtained. Contrary to previous experimental evidence and theoretical expectations, the nanowires are found to crystallize at this scale and display amorphous-to-crystalline phase changes, fulfilling an important prerequisite of a memory element. We show evidence for the smallest phase-change material, extending thus the size limit to explore phase-change memory devices at extreme scales.
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影响因子：
10.8
作者：
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通讯作者：
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