公开(公告)号：US20160288166A1

公开(公告)日：2016-10-06

申请号：US15037719

申请日：2014-11-21

Applicant: THUNDER BAY REGIONAL RESEARCH INSTITUTE

Inventor： Oleg RUBEL ,  Samuel PICHARDO ,  Laura CURIEL ,  Sheikh Jamil AHMED ,  Jeremy COLE

IPC: B06B1/06 ,  H01L41/09 ,  H01L41/04 ,  B06B1/02 ,  H01L41/047

CPC classification number: B06B1/06 ,  A61B8/12 ,  A61B8/4483 ,  A61B8/546 ,  A61N7/00 ,  A61N2007/0043 ,  B06B1/0207 ,  B06B1/0215 ,  B06B1/0238 ,  B06B2201/71 ,  B06B2201/72 ,  B06B2201/76 ,  B08B3/12 ,  H01L41/042 ,  H01L41/047 ,  H01L41/09

Abstract: Methods and devices are described for driving ferroelectric perovskite oxide crystals to achieve polarization inversion with reduced coercivity. In some embodiments, the anisotropy in the potential energy surface of a ferroelectric material is employed to drive polarization inversion and switching with a reduced coercive field relative to uniaxial excitation. In some embodiments, polarization inversion with reduced coercivity is produced via the application of an electric field that exhibits a time-dependent orientation, in contrast with conventional uniaxial electrical excitation, thereby causing the central ion (and the crystal structure as a whole) to evolve along a lower-energy path, in which the central ion is driven such that it avoids the potential energy maximum. This may be achieved, for example, by applying at least two non-parallel time-dependent voltages (e.g. bias, potential) such that orientation of the electric field changes with time during the switching cycle.

Abstract translation: 描述了用于驱动铁电钙钛矿氧化物晶体以降低矫顽力的极化反转的方法和装置。 在一些实施例中，铁电材料的势能表面中的各向异性用于驱动极化反转和相对于单轴激励的减小的矫顽场的切换。 在一些实施例中，与传统的单轴电激励相反，通过施加呈现时间依赖取向的电场产生具有降低的矫顽力的极化反转，从而使中心离子（和晶体结构整体）放出 沿着较低能量的路径，其中中心离子被驱动，使得其避免了最大的势能。 这可以通过例如通过施加至少两个不平行的时间相关电压（例如偏置，电位）来实现，使得电场的取向在开关周期期间随时间而变化。