Direct switching of polarization vortex in triangular ferroelectric nanodots: Role of crystal orientation

Lich, Le Van; Le, Minh-Tien; Vu, Ngoc-Lu; Nguyen, Hong-Dang; Le, Van-Tuan; Ha, Minh-Tan; Nguyen, Trong‐Giang; Dinh, Van‐Hai

doi:10.1103/physrevb.104.024104

Cited by 3 publications

(1 citation statement)

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“…Nevertheless, it is still a challenge in practice to realize a large enough and highly localized curled electric field to switch the vortex [9][10][11][12][13][14][15][16][17][18]. To avoid the use of curled electric fields, various vortex switching strategies have been also proposed, e.g., via geometry design [9][10][11][12], defect engineering [13,14], asymmetric mechanical loads [14][15][16], nonuniform electric fields [17], sweeping tip fields [18], etc. The key idea of these strategies is to bring some kind of asymmetry to the vortex system, such that nucleation of vortex with a deterministic charity is favored.…”

Section: Introductionmentioning

confidence: 99%

Path-dependent Vortex Switching in Ferroelectric Nanoplate Junctions Toward a Memory Device Concept

2022

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Ferroelectric vortex has attracted much attention as a promising candidate for memories with high density and high stability. It is a crucial problem to precisely manipulate the vortex chirality in order to utilize it to store information. Nevertheless, so far, a practical and direct strategy for vortex switching is still lacking. Moreover, the strong coupling of chirality between neighboring vortices in continuous systems like superlattices limits the application of ferroelectric-vortex-based memories. Here, we design a ferroelectric nanoplate junction to break the strong coupling between neighboring vortices. Phase-field simulation results demonstrate that the vortex chirality of the nanoplates could be efficiently tuned by sweeping local electric and thermal fields in the nanoplate junction. More importantly, the weak coupling between two neighboring nanoplates through the intermediate junction brings a deterministic vortex switching behavior. Based on this, we propose a concept of vortex memory devices. Our study provides an effective way to control the vortex chirality and suggests an opportunity for designing new memory devices based on ferroelectric vortex.

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Section: Introductionmentioning

confidence: 99%

Path-dependent Vortex Switching in Ferroelectric Nanoplate Junctions Toward a Memory Device Concept

2022

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Collective control of a vortex array in a ferroelectric ultrathin film

Ruan,

Xiong,

Liu

et al. 2024

Applied Physics Letters

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Recently, the observation of ferroelectric vortex arrays has triggered the investigation of topological domain structures and their characteristics. Vortices are typical topological domain structures with chirality in nanoscale ferroelectric materials. The chirality of a single vortex in a nanodot can be easily manipulated, but the collective control of a vortex array is exceptionally difficult and has not yet been realized. This Letter proposes an effective scheme for the collective control of a vortex array and investigates it via phase-field simulations. The results indicate that the collective control of a vortex array with bidirectional switching can be realized by introducing a bending film with periodic large curvatures under alternative electric fields. Furthermore, a general rule for determining the electrically controllable chirality of ferroelectric vortices is proposed. This Letter demonstrates the feasibility of the collective control of vortex arrays and provides insights for developing ferroelectric nanoelectronic devices based on vortex arrays.

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Strain manipulation of ferroelectric skyrmion bubbles in a freestanding PbTiO3 film: A phase field simulation

Zhang

Huang

et al. 2022

Phys. Rev. B

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Direct switching of polarization vortex in triangular ferroelectric nanodots: Role of crystal orientation

Cited by 3 publications

References 53 publications

Path-dependent Vortex Switching in Ferroelectric Nanoplate Junctions Toward a Memory Device Concept

Path-dependent Vortex Switching in Ferroelectric Nanoplate Junctions Toward a Memory Device Concept

Collective control of a vortex array in a ferroelectric ultrathin film

Strain manipulation of ferroelectric skyrmion bubbles in a freestanding PbTiO3 film: A phase field simulation

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