Retention of intermediate polarization states in ferroelectric materials enabling memories for multi-bit data storage

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

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

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)O3. 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.

Original languageEnglish
Article number232907
JournalApplied Physics Letters
Volume108
Issue number23
DOIs
Publication statusPublished - 6 Jun 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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