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Unusual phase transitions in ferroelectric nanodisks and nanorods

Author

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  • Ivan I. Naumov

    (University of Arkansas)

  • L. Bellaiche

    (University of Arkansas)

  • Huaxiang Fu

    (University of Arkansas)

Abstract

Bulk ferroelectrics undergo structural phase transformations at low temperatures, giving multi-stable (that is, multiple-minimum) degenerate states with spontaneous polarization. Accessing these states by applying, and varying the direction of, an external electric field is a key principle for the operation of devices such as non-volatile ferroelectric random access memories1 (NFERAMs). Compared with bulk ferroelectrics, low-dimensional finite ferroelectric structures promise to increase the storage density of NFERAMs 10,000-fold2. But this anticipated benefit hinges on whether phase transitions and multi-stable states still exist in low-dimensional structures. Previous studies have suggested that phase transitions are impossible in one-dimensional systems3,4,5, and become increasingly less likely as dimensionality further decreases3,4,5,6. Here we perform ab initio studies of ferroelectric nanoscale disks and rods of technologically important Pb(Zr,Ti)O3 solid solutions, and demonstrate the existence of previously unknown phase transitions in zero-dimensional ferroelectric nanoparticles. The minimum diameter of the disks that display low-temperature structural bistability is determined to be 3.2 nm, enabling an ultimate NFERAM density of 60 × 1012 bits per square inch—that is, five orders of magnitude larger than those currently available7. Our results suggest an innovative use of ferroelectric nanostructures for data storage, and are of fundamental value for the theory of phase transition in systems of low dimensionality.

Suggested Citation

  • Ivan I. Naumov & L. Bellaiche & Huaxiang Fu, 2004. "Unusual phase transitions in ferroelectric nanodisks and nanorods," Nature, Nature, vol. 432(7018), pages 737-740, December.
  • Handle: RePEc:nat:nature:v:432:y:2004:i:7018:d:10.1038_nature03107
    DOI: 10.1038/nature03107
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    Citations

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    Cited by:

    1. Mingqiang Li & Tiannan Yang & Pan Chen & Yongjun Wang & Ruixue Zhu & Xiaomei Li & Ruochen Shi & Heng-Jui Liu & Yen-Lin Huang & Xiumei Ma & Jingmin Zhang & Xuedong Bai & Long-Qing Chen & Ying-Hao Chu &, 2022. "Electric-field control of the nucleation and motion of isolated three-fold polar vertices," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Jing Wang & Deshan Liang & Jing Ma & Yuanyuan Fan & Ji Ma & Hasnain Mehdi Jafri & Huayu Yang & Qinghua Zhang & Yue Wang & Changqing Guo & Shouzhe Dong & Di Liu & Xueyun Wang & Jiawang Hong & Nan Zhang, 2023. "Polar Solomon rings in ferroelectric nanocrystals," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    3. Longju Yu & Hong Jian Zhao & Peng Chen & Laurent Bellaiche & Yanming Ma, 2023. "The anti-symmetric and anisotropic symmetric exchange interactions between electric dipoles in hafnia," Nature Communications, Nature, vol. 14(1), pages 1-9, December.
    4. Wei Luo & Alireza Akbarzadeh & Yousra Nahas & Sergei Prokhorenko & Laurent Bellaiche, 2023. "Quantum criticality at cryogenic melting of polar bubble lattices," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    5. S. Prokhorenko & Y. Nahas & V. Govinden & Q. Zhang & N. Valanoor & L. Bellaiche, 2024. "Motion and teleportation of polar bubbles in low-dimensional ferroelectrics," Nature Communications, Nature, vol. 15(1), pages 1-10, December.
    6. Chaehwa Jeong & Juhyeok Lee & Hyesung Jo & Jaewhan Oh & Hionsuck Baik & Kyoung-June Go & Junwoo Son & Si-Young Choi & Sergey Prosandeev & Laurent Bellaiche & Yongsoo Yang, 2024. "Revealing the three-dimensional arrangement of polar topology in nanoparticles," Nature Communications, Nature, vol. 15(1), pages 1-16, December.
    7. Yu-Tsun Shao & Sujit Das & Zijian Hong & Ruijuan Xu & Swathi Chandrika & Fernando Gómez-Ortiz & Pablo García-Fernández & Long-Qing Chen & Harold Y. Hwang & Javier Junquera & Lane W. Martin & Ramamoort, 2023. "Emergent chirality in a polar meron to skyrmion phase transition," Nature Communications, Nature, vol. 14(1), pages 1-9, December.

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