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首页> 外文期刊>Applied Physics Letters >Retention of intermediate polarization states in ferroelectric materials enabling memories for multi-bit data storage
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Retention of intermediate polarization states in ferroelectric materials enabling memories for multi-bit data storage

机译：保留铁电材料中的中间极化状态，从而实现用于多位数据存储的存储器

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摘要

A homogeneous ferroelectric single crystal exhibits only two remanent polarization states that are stable over time, whereas intermediate, or unsaturated, polarization states are thermodynamically instable. Commonly used ferroelectric materials however, are inhomogeneous polycrystalline thin films or ceramics. To investigate the stability of intermediate polarization states, formed upon incomplete, or partial, switching, we have systematically studied their retention in capacitors comprising two classic ferroelectric materials, viz. random copolymer of vinylidene fluoride with trifluoroethylene, P(VDF-TrFE), and Pb(Zr,Ti)O_3. Each experiment started from a discharged and electrically depolarized ferroelectric capacitor. Voltage pulses were applied to set the given polarization states. The retention was measured as a function of time at various temperatures. The intermediate polarization states are stable over time, up to the Curie temperature. We argue that the remarkable stability originates from the coexistence of effectively independent domains, with different values of polarization and coercive field. A domain growth model is derived quantitatively describing deterministic switching between the intermediate polarization states. We show that by using well-defined voltage pulses, the polarization can be set to any arbitrary value, allowing arithmetic programming. The feasibility of arithmetic programming along with the inherent stability of intermediate polarization states makes ferroelectric materials ideal candidates for multibit data storage.
机译：均匀铁电单晶仅表现出两个随时间稳定的剩余极化状态，而中间或不饱和极化状态在热力学上不稳定。但是，常用的铁电材料是不均匀的多晶薄膜或陶瓷。为了研究在不完全或部分切换时形成的中间极化状态的稳定性，我们系统地研究了它们在包含两种经典铁电材料的电容器中的保持力。偏二氟乙烯与三氟乙烯，P（VDF-TrFE）和Pb（Zr，Ti）O_3的无规共聚物。每个实验都从放电且电去极化的铁电电容器开始。施加电压脉冲以设置给定的极化状态。在各种温度下，保留时间是时间的函数。在居里温度以下，中间极化态随时间稳定。我们认为卓越的稳定性源于有效独立域的共存，具有不同的极化和矫顽场。得出域增长模型，该模型定量描述了中间极化状态之间的确定性切换。我们表明，通过使用定义明确的电压脉冲，可以将极化设置为任何任意值，从而可以进行算术编程。算术编程的可行性以及中间极化态的固有稳定性使铁电材料成为多位数据存储的理想候选者。

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  • 来源
    《Applied Physics Letters》 |2016年第23期|232907.1-232907.5|共5页
  • 作者

    Dong Zhao; Ilias Katsouras; Kamal Asadi; Wilhelm A. Groen; Paul W. M. Blom; Dago M. de Leeuw;

  • 作者单位

    Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;

    Holst Centre, High Tech Campus 31, 5656AE Eindhoven, The Netherlands;

    Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;

    Holst Centre, High Tech Campus 31, 5656AE Eindhoven, The Netherlands,Faculty of Aerospace Engineering, Delft University of Technology, Kluyverweg 1 2629 HS, Delft, The Netherlands;

    Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;

    Max-Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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