Weight update in ferroelectric memristors with identical and non-identical pulses
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arXiv
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| Autori principali: | , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866910560183910400 |
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| author | Lancaster, Suzanne Remillieux, Maximilien Engl, Moritz Havel, Viktor Silva, Claudia Wang, Xuetao Mikolajick, Thomas Slesazeck, Stefan |
| author_facet | Lancaster, Suzanne Remillieux, Maximilien Engl, Moritz Havel, Viktor Silva, Claudia Wang, Xuetao Mikolajick, Thomas Slesazeck, Stefan |
| contents | Ferroelectric tunnel junctions (FTJs) are a class of memristor which promise low-power, scalable, field-driven analog operation. In order to harness their full potential, operation with identical pulses is targeted. In this paper, several weight update schemes for FTJs are investigated, using either non-identical or identical pulses, and with time delays between the pulses ranging from 1 us to 10 s. Experimentally, a method for achieving non-linear weight update with identical pulses at long programming delays is demonstrated by limiting the switching current via a series resistor. Simulations show that this concept can be expanded to achieve weight update in a 1T1C cell by limiting the switching current through a transistor operating in sub-threshold or saturation mode. This leads to a maximum linearity in the weight update of 86% for a dynamic range (maximum switched polarization) of 30 μC/cm2. It is further demonstrated via simulation that engineering the device to achieve a narrower switching peak increases the linearity in scaled devices to >93 % for the same range. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_15796 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Weight update in ferroelectric memristors with identical and non-identical pulses Lancaster, Suzanne Remillieux, Maximilien Engl, Moritz Havel, Viktor Silva, Claudia Wang, Xuetao Mikolajick, Thomas Slesazeck, Stefan Materials Science Applied Physics Ferroelectric tunnel junctions (FTJs) are a class of memristor which promise low-power, scalable, field-driven analog operation. In order to harness their full potential, operation with identical pulses is targeted. In this paper, several weight update schemes for FTJs are investigated, using either non-identical or identical pulses, and with time delays between the pulses ranging from 1 us to 10 s. Experimentally, a method for achieving non-linear weight update with identical pulses at long programming delays is demonstrated by limiting the switching current via a series resistor. Simulations show that this concept can be expanded to achieve weight update in a 1T1C cell by limiting the switching current through a transistor operating in sub-threshold or saturation mode. This leads to a maximum linearity in the weight update of 86% for a dynamic range (maximum switched polarization) of 30 μC/cm2. It is further demonstrated via simulation that engineering the device to achieve a narrower switching peak increases the linearity in scaled devices to >93 % for the same range. |
| title | Weight update in ferroelectric memristors with identical and non-identical pulses |
| topic | Materials Science Applied Physics |
| url | https://arxiv.org/abs/2407.15796 |