Y. P. Feng

Songshan Lake Materials Laboratory

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Yujia Wang

Liaoning Shihua University

Xiuliang Ma

Chinese Academy of Sciences

Yin‐Lian Zhu

Chinese Academy of Sciences

Yun‐Long Tang

Chinese Academy of Sciences

Wan‐Rong Geng

Songshan Lake Materials Laboratory

Jun Ding

National University of Singapore

Jinghui Wang

Chinese Academy of Sciences

H. J. Zhao

Jilin University

Min‐Jie Zou

Songshan Lake Materials Laboratory

Rujian Jiang

Chinese Academy of Sciences

Cooperative Institutions

Chinese Academy of Sciences

Wuhan University

University of Science and Technology of China

National University of Singapore

Institute of Physics

University of Chinese Academy of Sciences

Harbin Institute of Technology

Songshan Lake Materials Laboratory

Southern University of Science and Technology

National Yang Ming Chiao Tung University

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Polar Bloch points in strained ferroelectric films

Nature Communications (2024)

Yujia Wang Y. P. Feng Yun‐Long Tang Yin‐Lian Zhu Yi Cao

Abstract Topological domain structures have drawn great attention as they have potential applications in future electronic devices. As an important concept linking the quantum and classical magnetism, a magnetic Bloch point, predicted in 1960s but not observed directly so far, is a singular point around which magnetization vectors orient to nearly all directions. Here we show polar Bloch points in tensile-strained ultrathin ferroelectric PbTiO 3 films, which are alternatively visualized by phase-field simulations and aberration-corrected scanning transmission electron microscopic imaging. The phase-field simulations indicate local steady-state negative capacitance around the Bloch points. The observation of polar Bloch points and their emergent properties consequently implies novel applications in future integrated circuits and low power electronic devices.

Magnetism

Bloch wave

10.1038/s41467-024-48216-1

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Citations (6)

A model for magnetic ordering in inhomogeneous amorphous RE–Fe–Al alloys

Journal of Magnetism and Magnetic Materials (2001)

Lan Wang Jun Ding Y. Li Y. P. Feng N.X. Phuc

10.1016/s0304-8853(00)00941-0

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Citations (4)

Exchange bias and magnetic properties induced by intrinsic structural distortion in CaMn3O6 nanoribbons

Applied Physics Letters (2014)

Jiangying Yu Chung‐Che Huang Hanxiang Wu Y. P. Feng L. Wang

Single-crystalline CaMn3O6 nanoribbons have been synthesized by a molten-salt method. To explore the origin of the magnetism of nanosized antiferromagnetic (AFM) manganites, a comparative study has been conducted for CaMn3O6 (CMO-1) and post-growth vacuum annealed (CMO-2) nanoribbons. A lattice expansion resulting from oxygen release during vacuum annealing is observed. Correspondingly, AFM ordering in CMO-2 is further suppressed, and ferromagnetism and spin-glass (SG)-like behavior are significantly enhanced, which are presumed attributable to the intrinsic structural distortions induced by oxygen vacancies. In this case, side and surface effects are not decisive factors. In addition, this study provided observations of the exchange bias effect in manganite nanoribbons with an AFM-SG-like-ferromagnetic (FM) structure, as compared with the typical AFM-core-FM-shell.

Exchange bias

Magnetism

Manganite

10.1063/1.4862203

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Citations (8)

Liquid metal for high-entropy alloy nanoparticles synthesis

Nature (2023)

Guanghui Cao Jingjing Liang Zenglong Guo Kena Yang Gang Wang

Liquid metal

10.1038/s41586-023-06082-9

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Citations (139)

Enhanced polarization switching characteristics of HfO2 ultrathin films via acceptor-donor co-doping

Nature Communications (2024)

Chao Zhou Liyang Ma Y. P. Feng Chang‐Yang Kuo Yu‐Chieh Ku

Abstract In the realm of ferroelectric memories, HfO 2 -based ferroelectrics stand out because of their exceptional CMOS compatibility and scalability. Nevertheless, their switchable polarization and switching speed are not on par with those of perovskite ferroelectrics. It is widely acknowledged that defects play a crucial role in stabilizing the metastable polar phase of HfO 2 . Simultaneously, defects also pin the domain walls and impede the switching process, ultimately rendering the sluggish switching of HfO 2 . Herein, we present an effective strategy involving acceptor-donor co-doping to effectively tackle this dilemma. Remarkably enhanced ferroelectricity and the fastest switching process ever reported among HfO 2 polar devices are observed in La 3+ -Ta 5+ co-doped HfO 2 ultrathin films. Moreover, robust macro-electrical characteristics of co-doped films persist even at a thickness as low as 3 nm, expanding potential applications of HfO 2 in ultrathin devices. Our systematic investigations further demonstrate that synergistic effects of uniform microstructure and smaller switching barrier introduced by co-doping ensure the enhanced ferroelectricity and shortened switching time. The co-doping strategy offers an effective avenue to control the defect state and improve the ferroelectric properties of HfO 2 films.

Acceptor

10.1038/s41467-024-47194-8

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Citations (21)

Size-dependent magnetism and spin-glass behavior of amorphous NiO bulk, clusters, and nanocrystals: Experiments and first-principles calculations

Physical Review B (2007)

Jiabao Yi Jun Ding Y. P. Feng Guowen Peng Gan Moog Chow

A combined experimental and computational study was carried out to investigate magnetic properties of NiO nanostructures. Remarkable size-dependent magnetism was discovered. Uniform amorphous NiO showed a dominated antiferromagnetic interaction and an ordering temperature of $3.5\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. NiO clusters (up to $1\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$) tend to be ferromagnetic interaction with an ordering temperature of $35\phantom{\rule{0.3em}{0ex}}\mathrm{K}$, accompanied by high magnetization $(105\phantom{\rule{0.3em}{0ex}}\mathrm{emu}∕\mathrm{g})$ and a spin-glass behavior. NiO nanocrystals $(>2\phantom{\rule{0.3em}{0ex}}\mathrm{nm})$ were found to be antiferromagnetic with uncompensated surface magnetization and shifted hysteresis due to the core-shell interactions.

Magnetism

Non-blocking I/O

Hysteresis

10.1103/physrevb.76.224402

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Citations (100)

A Roadmap for Ferroelectric–Antiferroelectric Phase Transition

Nano Letters (2024)

Rujian Jiang Yun‐Long Tang Suzhen Liu Mei-Xiong Zhu Changji Li

Antiferroelectric materials have shown great potential in electronic devices benefiting from the reversible phase transition between ferroelectric and antiferroelectric phases. Understanding the dipole arrangements and clear phase transition pathways is crucial for design of antiferroelectric materials-based energy storage and conversion devices. However, the specific phase transition details remain largely unclear and even controversial to date. Here, we have grown a series of PbZrO

Antiferroelectricity

Ferroics

10.1021/acs.nanolett.4c03382

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Citations (2)

Band structure of Mg_1-xZn_xS_ySe_1-y

Semiconductor Science and Technology (1994)

K. L. Teo Y. P. Feng M F Li Tow Chong Chong Jian‐Bai Xia

The empirical pseudopotential method within the virtual crystal approximation is used to calculate the band structure of Mg1-xZnxSySe1-y, which has recently been proved to be a potential semiconductor material for optoelectronic device applications in the blue spectral region. It is shown that MgZnSSe can be a direct or an indirect semiconductor depending on the alloy composition. Electron and hole effective masses are calculated for different compositions. Polynomial approximations are obtained for both the energy gap and the effective mass as functions of alloy composition at the Gamma valley. This information will be useful for the future design of blue wavelength optoelectronic devices as well as for assessment of their properties.

Pseudopotential

Crystal (programming language)

10.1088/0268-1242/9/4/003

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Citations (33)

Statistical composition-structure-property correlation and glass-forming ability based on the full icosahedra in Cu–Zr metallic glasses

Applied Physics Letters (2010)

Zhen-Dong Sha Y. P. Feng Y. Li

Using the large-scale atomic/molecular massively parallel simulator, fraction of the Cu-centered ⟨0,0,12,0⟩ full icosahedra (fico) is obtained from a statistical analysis over a broad compositional range with high resolution in the Cu–Zr binary system. Weak but significant peaks are observed at certain compositions which coincide with good glass formers. This correlation implies that the change in fico is a fundamental structural factor in determining the ease of glass formation. In this regard, fico can be an indicator of glass-forming ability. Our work provides further understanding on the atomic structure of the Cu–Zr system and its effect on glass formation.

Atomic units

Coordination number

Characterization

10.1063/1.3310278

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Citations (87)

Dipolar wavevector interference induces a polar skyrmion lattice in strained BiFeO3 films

Nature Nanotechnology (2025)

Wan‐Rong Geng Yin‐Lian Zhu Mei-Xiong Zhu Yun‐Long Tang H. J. Zhao

Skyrmion

Wave vector

Lattice (music)

10.1038/s41565-024-01845-5

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Citations (0)