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Your search keyword '"Gao, Xingsen"' showing total 284 results
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284 results on '"Gao, Xingsen"'

1. Room-temperature sub-100 nm N\'eel-type skyrmions in non-stoichiometric van der Waals ferromagnet $\rm Fe_{3-x}GaTe_{2}$ with ultrafast laser writability

Author

Li, Zefang, Zhang, Huai, Li, Guanqi, Guo, Jiangteng, Wang, Qingping, Deng, Ying, Hu, Yue, Hu, Xuange, Liu, Can, Qin, Minghui, Shen, Xi, Yu, Richeng, Gao, Xingsen, Liao, Zhimin, Liu, Junming, Hou, Zhipeng, Zhu, Yimei, and Fu, Xuewen

Subjects
Condensed Matter - Materials Science
Abstract

Realizing room-temperature magnetic skyrmions in two-dimensional van der Waals ferromagnets offers unparalleled prospects for future spintronic applications. However, due to the intrinsic spin fluctuations that suppress atomic long-range magnetic order and the inherent inversion crystal symmetry that excludes the presence of the Dzyaloshinskii-Moriya interaction, achieving room-temperature skyrmions in 2D magnets remains a formidable challenge. In this study, we target room-temperature 2D magnet $\rm Fe_3GaTe_2$ and unveil that the introduction of iron-deficient into this compound enables spatial inversion symmetry breaking, thus inducing a significant Dzyaloshinskii-Moriya interaction that brings about room-temperature N\'eel-type skyrmions with unprecedentedly small size. To further enhance the practical applications of this finding, we employ a homemade in-situ optical Lorentz transmission electron microscopy to demonstrate ultrafast writing of skyrmions in $\rm Fe_{3-x}GaTe_2$ using a single femtosecond laser pulse. Our results manifest the $\rm Fe_{3-x}GaTe_2$ as a promising building block for realizing skyrmion-based magneto-optical functionalities.

Published
2024
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3. Domain evolution in BiFeO3 epitaxial nanoisland array via post-annealing.

Author

Tian, Guo, Zhang, Xingchen, Wang, Gui, Jin, Jun, Zhou, Houlin, Dai, Ji-Yan, Liu, Jun-Ming, and Gao, Xingsen

Subjects
TOPOLOGICAL property, STRIPES, OXYGEN
Abstract

We describe the impact of post-annealing on ferroelectric-domain structures in arrays of BiFeO3 (BFO) epitaxial nanoislands, which exhibit a domain evolution from an initial 71° stripe/vortex domains to center-convergent topological domains. These results suggest that the increase and redistribution of charged defects, e.g., oxygen vacancies, in BFO nanoislands play a crucial role in driving the formation of center-type domain structures. The observation of defect-driven domain evolution in BFO nanoislands provides a path for further exploring their formation mechanism, topological properties, novel functionalities, and potential applications. [ABSTRACT FROM AUTHOR]

Published
2024
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27. Highly tunable skyrmion-like polar nanodomains for high-density ferroelectric hard disks.

Author

Chen, Hongying, Yang, Wenda, Li, Cheng, Jiao, Peijie, Liu, Zhiyu, Lin, Chuanjie, Chen, Yaoyao, Tian, Guo, Deng, Yu, Nie, Yuefeng, Wu, Yongjun, Liu, Jun-Ming, Hong, Zijian, Gao, Xingsen, and Wu, Di

Subjects
ATOMIC force microscopes, HARD disks, ELECTRONIC equipment, HETEROSTRUCTURES
Abstract

Emerging topological polar domains have a wide range of potential applications in electronic devices. It is critical to accurately manipulate these topological domains by electrical fields and explore their exotic properties for making more energy-efficient high-density non-volatile memories. Herein, we demonstrate that skyrmion-like polar nanodomains appear at room temperature in SrTiO3/PbTiO3 bilayer heterostructures by balancing the elastic and electrostatic energies via varying the SrTiO3 capping layer thickness. These polar nanodomains, stable at room temperature, can be electrically written, erased, and rewritten into the bilayer by applying an appropriate bias on the conductive tip of an atomic force microscope. The lateral size and location of these polar nanodomains can be precisely controlled. Moreover, ring-shaped conductive domain walls are observed around these polar nanodomains, with on/off ratios of more than two orders of magnitude with respect to the ferroelectric background. Based on these characteristics, the polar nanodomains can be created, erased, and probed electrically, suggesting applications for high-density ferroelectric hard disks. [ABSTRACT FROM AUTHOR]

Published
2024
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38. Observation of center-type quad-domain structures in ordered BiFeO3 nanoisland arrays fabricated via mask-assisted pulsed laser deposition.

Author

Zhang, Xingchen, Guo, Yihang, Tian, Guo, Song, Zhiqing, Chen, Chao, Yang, Wenda, Hou, Zhipeng, Chen, Deyang, Fan, Zhen, Zhou, Guofu, Liu, Jun-Ming, and Gao, Xingsen

Subjects
PULSED laser deposition, PHASE transitions, PROCESS heating, ELECTRONIC equipment, ELECTRIC fields
Abstract

Exotic topological domains in BiFeO3 nanoislands have attracted much attention regarding their potential applications in advanced electronic devices. Here, different from the earlier reported disordered distributed BiFeO3 nanoislands formed by a self-assembly method, we fabricated an ordered BiFeO3 nanoisland array by mask-assisted pulsed laser deposition on a SrTiO3 substrate, which exhibits a center-converged in-plane polarization component and a monodomain pattern along the vertical direction. Such center-type quad-domain structures exhibit high stability, maintaining their topological structures after heating to 250 °C and subsequently cooling to room temperature. Moreover, they can be switched by applying a scanning electric field and recovered by applying a heating and cooling process. Observing this topological structure in BiFeO3 nanoislands might provide a suitable platform for further exploration of its topological phase transition properties, new functions, and potential applications. [ABSTRACT FROM AUTHOR]

Published
2023
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40. Tunable topological domain structures in high-density PbTiO3 nanodots array.

Author

Chen, Hongying, Liu, Zhiyu, Tian, Guo, Wang, Gui, Guo, Yihang, Duan, Zongwen, Wu, Di, Deng, Yu, Wang, Guoyu, Hou, Zhipeng, Chen, Deyang, Fan, Zhen, Qin, Minghui, Dai, Ji-Yan, Liu, Jun-Ming, and Gao, Xingsen

Subjects
NANODOTS, ATOMIC force microscopy, THIN films, NANOELECTRONICS
Abstract

In this work, we demonstrated that tunable topological domain structures, e.g., center-type domains and skyrmion-like polar bubbles, can be generated at room temperature in high-density epitaxial PbTiO3 nanodots fabricated via the template-assisted tailoring of thin films. These topological domain structures can be manipulated electrically by applying an appropriate bias on the conductive atomic force microscopy tip, allowing for writing, erasing, and rewriting of topological domains into the nanodot. Moreover, ring-shaped conductive channels are observed around the center-type domain states. These findings provide a playground for further exploring their emerging functionalities and application potentials for nanoelectronics. [ABSTRACT FROM AUTHOR]

Published
2024
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