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首页> 外文期刊>IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control >Material Design Strategy for Enhancement of Readback Signal Intensity in Ferroelectric Probe Data Storage
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Material Design Strategy for Enhancement of Readback Signal Intensity in Ferroelectric Probe Data Storage

机译：铁电探头数据存储中倒回信号强度的材料设计策略

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摘要

Ferroelectric probe data storage (FPDS) based on scanning nonlinear dielectric microscopy is expected as a next-generation data storage method with its large potential for improvement of the recording density. However, this novel method has a problem of low reading speed. To overcome this problem, a novel ferroelectric recording medium with large nonlinear permittivity is required because this data storage method uses the nonlinear dielectric response induced by small-amplitude ac bias to detect the bit data recorded in the form of polarization direction. Therefore, this article discusses nonlinear permittivity enhancement from the viewpoint of data storage application in the framework of the phenomenological theory. We reveal that the Curie-point control is one of the key techniques in material design for FPDS because nonlinear permittivity increases precipitously as the Curie temperature is approached, as with the linear permittivity and piezoelectric constants. A similar conclusion is also obtained through actual measurements of nonlinear permittivity in LiTaO3 single crystals. On the other hand, we also reveal that there is a tradeoff relationship between nonlinear permittivity and polarization stability. To avoid this undesirable situation in data storage applications, pinning-site control will also be important. We also propose to employ a double-layer structure in the ferroelectric recording media for further improvement.
机译：基于扫描非线性介电显微镜的铁电探针数据存储（FPD）预计为下一代数据存储方法，其具有改善记录密度的大潜力。然而，这种新方法具有低读取速度的问题。为了克服该问题，需要具有大非线性介电常数的新型铁电记录介质，因为该数据存储方法使用由小幅度AC偏置的非线性介电响应来检测以偏振方向的形式记录的位数据。因此，本文从现象理论框架中的数据存储应用的观点来讨论非线性介电常数增强。我们揭示了CUIE点控制是FPD材料设计中的主要技术之一，因为在接近曲线温度和线性介电常数和压电常数时，非线性介电常数随着静脉温度而增加。还通过LiTaO3单晶中的非线性介电常数的实际测量来获得类似的结论。另一方面，我们还揭示了非线性介电常数与极化稳定性之间存在权衡关系。为避免在数据存储应用中的这种不良情况下，Pinning-Site控件也很重要。我们还建议在铁电记录介质中采用双层结构以进一步改进。

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