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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2023
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2311.05413 |
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| _version_ | 1866917836730925056 |
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| author | Baksa, Steven M. Gelin, Simon Oturak, Seda Spurling, Robert Jackson Sepehrinezhad, Alireza Jacques, Leonard Trolier-McKinstry, Susan E. van Duin, Adri C. T. Maria, Jon-Paul Rappe, Andrew M. Dabo, Ismaila |
| author_facet | Baksa, Steven M. Gelin, Simon Oturak, Seda Spurling, Robert Jackson Sepehrinezhad, Alireza Jacques, Leonard Trolier-McKinstry, Susan E. van Duin, Adri C. T. Maria, Jon-Paul Rappe, Andrew M. Dabo, Ismaila |
| contents | Ferroelectrics are of practical interest for non-volatile data storage due to their reorientable, crystallographically defined polarization. Yet efforts to integrate conventional ferroelectrics into ultrathin memories have been frustrated by film-thickness limitations, which impede polarization reversal under low applied voltage. Wurtzite materials, including magnesium-substituted zinc oxide (Zn,Mg)O, have been shown to exhibit scalable ferroelectricity as thin films. In this work, we explain the origins of ferroelectricity in (Zn,Mg)O, showing that large strain fluctuations emerge locally in (Zn,Mg)O and can reduce local barriers to ferroelectric switching by more than 40%. We provide concurrent experimental and computational evidence of these effects by demonstrating polarization switching in ZnO/(Zn,Mg)O/ZnO heterostructures featuring built-in interfacial strain gradients. These results open up an avenue to develop scalable ferroelectrics by controlling strain fluctuations atomistically. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_05413 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Strain fluctuations unlock ferroelectricity in wurtzites Baksa, Steven M. Gelin, Simon Oturak, Seda Spurling, Robert Jackson Sepehrinezhad, Alireza Jacques, Leonard Trolier-McKinstry, Susan E. van Duin, Adri C. T. Maria, Jon-Paul Rappe, Andrew M. Dabo, Ismaila Materials Science Ferroelectrics are of practical interest for non-volatile data storage due to their reorientable, crystallographically defined polarization. Yet efforts to integrate conventional ferroelectrics into ultrathin memories have been frustrated by film-thickness limitations, which impede polarization reversal under low applied voltage. Wurtzite materials, including magnesium-substituted zinc oxide (Zn,Mg)O, have been shown to exhibit scalable ferroelectricity as thin films. In this work, we explain the origins of ferroelectricity in (Zn,Mg)O, showing that large strain fluctuations emerge locally in (Zn,Mg)O and can reduce local barriers to ferroelectric switching by more than 40%. We provide concurrent experimental and computational evidence of these effects by demonstrating polarization switching in ZnO/(Zn,Mg)O/ZnO heterostructures featuring built-in interfacial strain gradients. These results open up an avenue to develop scalable ferroelectrics by controlling strain fluctuations atomistically. |
| title | Strain fluctuations unlock ferroelectricity in wurtzites |
| topic | Materials Science |
| url | https://arxiv.org/abs/2311.05413 |