A5076941049- Magnetic and transport properties of perovskites and related materials
- Magnetic properties of thin films
- Electronic and Structural Properties of Oxides
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Physics of Superconductivity and Magnetism
- ZnO doping and properties
- Theoretical and Computational Physics
- Topological Materials and Phenomena
- Surface and Thin Film Phenomena
- Magnetic Properties and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced Memory and Neural Computing
- Quantum and electron transport phenomena
- Ferroelectric and Piezoelectric Materials
- Characterization and Applications of Magnetic Nanoparticles
- 2D Materials and Applications
- Organic Light-Emitting Diodes Research
- Graphene research and applications
- Magnetic Properties and Synthesis of Ferrites
- Conducting polymers and applications
- Higher Education and Teaching Methods
- Iron oxide chemistry and applications
- Neural Networks and Applications
State Key Laboratory of Surface Physics
2016-2025
Fudan University
2016-2025
Collaborative Innovation Center of Advanced Microstructures
2016-2025
ShangHai JiAi Genetics & IVF Institute
2021-2025
Hefei University
2024-2025
Shanghai Innovative Research Center of Traditional Chinese Medicine
2024
Xi'an Jiaotong University
2021
Shanghai Fudan Microelectronics (China)
2018-2020
Nanjing University
2000-2020
Monash University
2020
The crystal and magnetic structures of single-crystalline hexagonal LuFeO(3) films have been studied using x-ray, electron, neutron diffraction methods. polar structure these are found to persist up 1050 K; the switchability behavior is observed at room temperature, indicating ferroelectricity. An antiferromagnetic order was shown occur below 440 K, followed by a spin reorientation resulting in weak ferromagnetic 130 K. This observation coexisting multiple ferroic orders demonstrates that...
Interfacial diffusion between magnetic electrodes and organic spacer layers is a serious problem in the spintronics which complicates attempts to understand spin-dependent transport mechanism hurts achievement of desirably high magnetoresistance (MR). We deposit nanodots instead atoms onto layer using buffer assist growth. Spin valves this method exhibit sharper interface giant MR up ∼300%. Analysis current-voltage characteristics indicates that carrier injection correlates with observed MR.
The rise of two-dimensional (2D) crystalline superconductors has opened a new frontier investigating unconventional quantum phenomena in low dimensions. However, despite the enormous advances achieved towards understanding underlying physics, practical device applications like sensors and detectors using 2D are still lacking. Here, we demonstrate nonreciprocal antenna devices based on atomically thin NbSe2. Reversible charge transport is unveiled NbSe2 through multi-reversal antisymmetric...
Artificial spin ice (ASI) consisting patterned array of nano-magnets with frustrated dipolar interactions offers an excellent platform to study physics using direct imaging methods. Moreover, ASI often hosts a large number nearly degenerated and non-volatile states that can be used for multi-bit data storage neuromorphic computing. The realization the device potential ASI, however, critically relies on capability transport characterization which has not been demonstrated so far. Using...
The chiral edge current is the boundary manifestation of Chern number a quantum anomalous Hall (QAH) insulator. van der Waals antiferromagnet MnBi2Te4 theorized to be QAH in odd-layers but has shown resistivity below quantization value at zero magnetic field. Here, we perform scanning superconducting interference device (sSQUID) microscopy on these seemingly failed insulators image their distribution. When gated charge neutral point, our exhibits current, which flows unidirectionally...
One-dimensional (1D) magnetic nanomaterials have attracted much attention recently because of their applications in recording and spintronics. Nevertheless, it remains a challenge to prepare free-standing nanowires high yield. This Communication reports the successful high-yield synthesis an interesting 1D ferromagnetic CoPt alloy by direct decomposition platinum acetylacetonate cobalt carbonyl compound ethylenediamine solvent through solvothermal reaction. The obtained tunable diameter...
We have studied the magnetic and magnetotransport properties of Mn-doped Ge grown by molecular-beam epitaxy. This group-IV dilute ferromagnetic semiconductor exhibits two transitions. An upper critical temperature TC* (∼112K for x∼0.05) is evident from extrapolated Curie–Weiss susceptibility Arrott plot analysis anomalous Hall effect data. The existence a lower TC (∼12K established ac data are fully compatible with bound polarons or clusters below which percolate at TC⪡TC*.
We present a comprehensive study of ferromagnetism and magnetotransport in Mn-doped germanium, grown with molecular-beam epitaxy. Ferromagnetism ${\mathrm{Mn}}_{x}{\mathrm{Ge}}_{1\ensuremath{-}x}$ $(0<x<0.09)$ is characterized by two different ordering temperatures ${T}_{C}$ ${T}_{C}^{*}$ ${T}_{C}⪡{T}_{C}^{*}$. The onset global ferromagnetic order at coincides the percolation threshold for (activated) charge transport. Magnetism between originates from ``clustered dopants'' associated...
Abstract For strongly correlated oxides, it has been a long-standing issue regarding the role of chemical ordering dopants on physical properties. Here, using unit cell by superlattice growth technique, we determine Pr dopant in colossal magnetoresistant (La 1− y ) x Ca MnO 3 (LPCMO) system, which well known for its large length-scale electronic phase separation phenomena. Our experimental results show that leads to marked reduction length scale separations. Moreover, compared with...
Being the first intrinsic antiferromagnetic (AFM) topological insulator (TI), MnBi
A new method for synthesizing metallic nanowires with diameters in the range of 10−100 Å has been reported. This methodology is based on a combination electroless deposition and template synthesis using ordered mesoporous materials. High-density copper nickel were obtained.
Optical lithography is used to fabricate LPCMO wires starting from a single (La(5/8-0.3)Pr(0.3))Ca3/8MnO3 (LPCMO) film epitaxially grown on LaAlO3(100) substrate. As the width of decreased, resistivity exhibits giant and ultrasharp steps upon varying temperature magnetic field in vicinity metal-insulator transition. The origin transitions attributed effect spatial confinement percolative transport manganites.
Uniaxially aligned CoFe2O4 nanorods (see Figure) are obtained by coprecipitation of Co2+, Fe2+, and C2O42– ions in a microemulsion solution, subsequent high-temperature decomposition CoFe2(C2O4)3. Each nanorod is made up "tectonic" assembly nanocrystals. Magnetization such materials may lead to their use high-density magnetic recording media high-performance electromagnetic spintronic devices.
Dopant segregation in a ${\mathrm{Mn}}_{\mathrm{x}}{\mathrm{Ge}}_{1\ensuremath{-}x}$ dilute magnetic semiconductor leads to remarkable self-assembly of Mn-rich nanocolumns, embedded fully compensated Ge matrix. Samples grown at $80\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$ display giant positive magnetoresistance that correlates directly with the distribution impurities. Annealing $200\phantom{\rule{0.2em}{0ex}}\ifmmode^\circ\else\textdegree\fi{}\mathrm{C}$...
Organic spintronic devices have been appealing because of the long spin lifetime charge carriers in organic materials and their low cost, flexibility chemical diversity. In previous studies, control resistance valves is generally achieved by alignment magnetization directions two ferromagnetic electrodes, generating magnetoresistance. Here we employ a new knob to tune adding thin ferroelectric interfacial layer between electrode spacer: magnetoresistance valve depends strongly on history...
Despite the low resistivity (~ 1 mohm cm), metallic electrical transport has not been commonly observed in inverse spinel NiCo2O4, except certain epitaxial thin films. Previous studies have stressed effect of valence mixing and degree inversion on electric conduction NiCo2O4 In this work, we studied microstructure by comparing films grown MgAl2O4 (111) Al2O3 (0001) substrates. Although optimal growth condition magnetic properties are similar for NiCo2O4/MgAl2O4 NiCo2O4/Al2O3, they show...
Electronic phase separation in complex oxides is the inhomogeneous spatial distribution of electronic phases, involving length scales much larger than those structural defects or nonuniform chemical dopants. While experimental efforts focused on and established its correlation with nonlinear responses under external stimuli, it remains controversial whether requires quenched disorder for realization. Early theory predicted that if perfectly "clean" samples could be grown, both nonlinearities...
Light-to-electricity conversion is crucial for energy harvesting and photodetection, requiring efficient electron-hole pair separation to prevent recombination. Traditional junction-based mechanisms using built-in electric fields fail in nonbarrier regions. Homogeneous material under a photovoltaic effect appealing but only realized noncentrosymmetric systems via bulk effect. Here we report the realization of by employing surface acoustic waves (SAWs) generate zero-bias photocurrent...
Ultrasonication of toluene solutions the heteropolynuclear cluster complex, Pt3Fe3(CO)15, in presence oleic acid and oleylamine affords surface-capped fcc FePt nanoparticles having an average diameter ca. 2 nm. Self-assembled arrays these on oxidized Si wafers undergo a fcc-to-fct phase transition at 775 °C to form ferromagnetic nanocrystals 5.8 nm well dispersed wafer surface. Room-temperature coercivity measurements annealed confirm high 22.3 kOe. Such for fct might result from use...