Coexisting phases of individual VO$_2$ nanoparticles for multilevel nanoscale memory
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arXiv
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| Format: | Preprint |
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2024
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| author | Kepič, Peter Horák, Michal Kabát, Jiří Křápek, Vlastimil Konečná, Andrea Šikola, Tomáš Ligmajer, Filip |
| author_facet | Kepič, Peter Horák, Michal Kabát, Jiří Křápek, Vlastimil Konečná, Andrea Šikola, Tomáš Ligmajer, Filip |
| contents | Vanadium dioxide (VO$_2$) has received significant interest in the context of nanophotonic metamaterials and memories owing to its reversible insulator-metal transition associated with significant changes in its optical and electronic properties. While the VO$_2$ transition has been extensively studied for several decades, the hysteresis dynamics of individual single-crystal VO$_2$ nanoparticles (NPs) remains largely unexplored. Here, employing transmission electron microscopy techniques, we investigate phase transitions of single VO$_2$ NPs in real time. Our analysis reveals the statistical distribution of the transition temperature and steepness and how they differ during forward (heating) and backward (cooling) transitions. We assess the stability of coexisting phases in individual NPs and prove the persistent multilevel memory at near-room temperatures using only a few VO$_2$ NPs. Our findings shed new light on the underlying physical mechanisms governing the hysteresis of VO$_2$ and establish VO$_2$ NPs as a promising component of optoelectronic and memory devices with enhanced functionalities. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13354 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Coexisting phases of individual VO$_2$ nanoparticles for multilevel nanoscale memory Kepič, Peter Horák, Michal Kabát, Jiří Křápek, Vlastimil Konečná, Andrea Šikola, Tomáš Ligmajer, Filip Mesoscale and Nanoscale Physics Materials Science Optics Vanadium dioxide (VO$_2$) has received significant interest in the context of nanophotonic metamaterials and memories owing to its reversible insulator-metal transition associated with significant changes in its optical and electronic properties. While the VO$_2$ transition has been extensively studied for several decades, the hysteresis dynamics of individual single-crystal VO$_2$ nanoparticles (NPs) remains largely unexplored. Here, employing transmission electron microscopy techniques, we investigate phase transitions of single VO$_2$ NPs in real time. Our analysis reveals the statistical distribution of the transition temperature and steepness and how they differ during forward (heating) and backward (cooling) transitions. We assess the stability of coexisting phases in individual NPs and prove the persistent multilevel memory at near-room temperatures using only a few VO$_2$ NPs. Our findings shed new light on the underlying physical mechanisms governing the hysteresis of VO$_2$ and establish VO$_2$ NPs as a promising component of optoelectronic and memory devices with enhanced functionalities. |
| title | Coexisting phases of individual VO$_2$ nanoparticles for multilevel nanoscale memory |
| topic | Mesoscale and Nanoscale Physics Materials Science Optics |
| url | https://arxiv.org/abs/2408.13354 |