Lunyong Zhang

Lunyong Zhang
Harbin Institute of Technology | HIT · School of Materials Science and Engineering

Ph.D
https://www.mdpi.com/journal/symmetry/special_issues/Advances_Metallic_Material_Symmetry_Asymmetry

About

80
Publications
43,167
Reads
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800
Citations
Citations since 2017
49 Research Items
651 Citations
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
2017201820192020202120222023050100150
Introduction
My researches are focused on the preparation craft of quantum materials including the single crystals and films to design and modulate their structures of crystallographic and interface on the advantages of single crystal growth methods like CVT, Floating zone, Flux and structure analysis techniques for example XRD, TEM and neutron scattering, and then further investigating their quantum level physical properties in particular on the electronic/magnetic behaviors by experimental techniques such as transport measurments, magnetism measurements, synchrotron XAS and XMCD. Expect coopertation with you, it is my pleasure. If you want, please contact me by allen.zhang.ly@gmail.com
Additional affiliations
November 2017 - present
November 2017 - present
Max Planck POSTECH Center of Complex Phase Materials, Pohang University of Science and Technology
Position
  • Associate Reseracher
March 2015 - September 2017
Max Planck POSTECH Center of Complex Phase Materials, Pohang University of Science and Technology
Position
  • PhD Student
Education
September 2008 - January 2012
Harbin Institute of Technology
Field of study
  • Crystal growth and solidification theory
September 2007 - January 2008
Harbin Institute of Technology
Field of study
  • Giant Magnetoimpedance metallic glass wires
September 2005 - July 2007
Harbin Institute of Technology
Field of study
  • Amorphous alloys

Publications

Publications (80)
Article
Full-text available
Orthorhombic SrIrO3 is a typical spin-orbit-coupled correlated metal that shows diversified physical properties under external stimuli. Here the nonlinear Hall effect and weakly temperature-dependent resistance are observed in a SrIrO3 film epitaxially grown on a SrTiO3 substrate. It infers that orthorhombic SrIrO3 is a semimetal oxide. However, a...
Article
Full-text available
Spin-orbit coupling induces nonperturbation effects in many recently developed novel fields including topological insulators and spin-orbit assistant Mott insulators. In this study, strongly temperature-dependent spin-orbit coupling is observed at a low temperature in a 5d strongly correlated compound, SrIrO3. With an increase in temperature, the r...
Article
The discovery of giant magnetoelectric effect in Fe2Mo3O8 has sparked considerable interest in investigating the novel effects of M2Mo3O8 (M = Zn, Mn, Fe, Co, Ni) family, in particular the emergent physics driven by the M site ions. Here, we studied the structural evolution due to M site mixing in the compound FeCoMo3O8 whose unit cell volume and l...
Article
Up to now, the research of liquid-liquid transition (LLT) has significantly improved the understanding of its liquid structure and evolution, which is crucial to addressing the longstanding problem with glass formation. However, it remains unclear how LLT affects the vitrification and structures of glasses, due to the challenge in experimentally ex...
Article
Overcoming the limitation of low superheat temperature problem is key for the applications of the induction skull melting technology in many important high melt point metals used in fields such as aerospace. The present paper presents an advanced numerical study to explain the mechanism of melt superheat temperature. A coupling model between electr...
Article
Bulk metallic glasses (BMGs) bear versatile advantages compared to traditional crystalline metallic materials. However, preparation of large size BMG components remains a great challenge due to the lack of understanding the casting dynamics of BMGs. The present work investigates the dynamics of the solidification process during casting of a Zr41.2T...
Article
Full-text available
Herein, we have presented the giant magneto-impedance (GMI) effect, microstructure and surface domain structure of the Co-Fe-based amorphous microwires after liquid medium—anhydrous ethanol Joule annealing (AJA). The AJA technique can effectively release the radial stress and induce large a circumferential magnetic field by changing the Joule heat...
Article
The overpotentials of electrochemical oxygen evolution reaction (OER) inherently originate from high electron transfer barriers of the redox couple driven water oxidation. Here, we propose a heat-induced magnetic transition strategy to reduce the spin-related electron transfer barriers. Coupling heat into electrochemical OER on a ferro-antiferromag...
Article
Wet etching has been a fundamental process for the fabrication of sapphire crystal substrates with critical position in the current semiconductor devices industry. The present work reveals the etching behaviors of cavities on the M‐plane {11¯${{\bar 1}}$00} of sapphire crystal by the hot KOH etchant. It is shown that the boundary of cavities change...
Article
Understanding the corrosion behaviors of bulk metallic glasses (BMGs) in practical working environment is essential for the applications of BMGs as corrosion resistance materials. The present work investigated the corrosion behaviors of Zr50.7Cu28Ni9Al12.3 (at. %) BMG and also its heat treated alloys with different volume fraction of crystallizatio...
Article
Full-text available
The desirable table-like magnetocaloric effect (MCE) was obtained by designing a new magnetic bed, which comprises three kinds of Gd-based microwire arrays with different Curie temperatures (TC). The TC interval among these wires is ~10 K. This new magnetic bed shows a smooth ferromagnetic to paramagnetic transition at ~100 K. In addition, a table-...
Article
Full-text available
Redox couple oxidation as an initial step of water oxidation may be key for high electricity consumption in the electrochemical oxygen evolution reaction (OER). Here, a heat‐induced magnetic transition strategy is reported to speed up the oxidation kinetics of redox couples. The activation energy of Ni²⁺/Ni³⁺ redox couple oxidation is sharply decre...
Article
Full-text available
Here, melt-extracted Ni- and Fe-based amorphous metallic fibers (AMFs) were annealed below their glass transition temperatures. The tensile behaviors and microstructures of the melt-extracted and the annealed AMF samples were studied. For melt-extracted Ni- and Fe-based samples, the difference of fracture angles can be attributed to their differenc...
Article
Full-text available
Developing light structure materials that work stably at elevated temperatures is a long-standing challenge for many application fields, particularly in the development of aerospace equipment. Zn/Cd alloying elements were prospected to improve the stability of the lightest Mg-Li based alloys; however, little is known about the intermediate-temperat...
Article
Mg-Gd-Y-Zr alloy has excellent mechanical properties at room and high temperatures, but its high oxidation properties can also result in a significant number of bifilm defects. However, its formation mechanism was not revealed so far, which was explored in the present work. The results showed that the surface oxide film folds into a grid-like doubl...
Preprint
Full-text available
We have designed a new magnetic bed structure with desirable table-like magnetocaloric effect (MCE) by using three kinds of soft ferromagnetic Gd-Al-Co microwire arrays with different Curie temperatures (T<sub>C</sub>). The T<sub>C</sub> interval of these three wires is ~10 K and the designed new structure named Sample A. This sample shows a smooth...
Article
Full-text available
In this paper, we report the results obtained from the hot compression behaviour of co-spray-formed Al-Si/7075 bimetallic gradient alloys by investigating the five selected layers divided evenly from top to bottom. It was found that with a decrease in the strain rate and an increase in temperature, the hot compression flow stress of deposited alloy...
Article
Spray forming technology has been adopted to prepare essential castings in various industry fields. Understanding what happen during the impaction of droplet on deposited layer is critical to optimize spray forming processes and so improve the final casting quality. The present work investigated the morphology evolution of droplet and deposited lay...
Article
Full-text available
Bimetallic gradient alloys have attracted research attention recently due to their potential applications in the aerospace and automobile industries. In this study, Al-20Si/7075 bimetallic gradient alloys were successfully manufactured by co-spray forming and the roll process. We investigated the thermal expansion behavior of the gradient alloy. It...
Article
In this paper, we adopted fluid oil joule annealing modulation (FOJA) for improving the Giant magneto-impedance (GMI) property of CoFe-based microwires with the microstructure and magnetic domain structure systematically investigated. Compared with general joule annealing (JA) method, a much larger DC current can be employed. The maximum GMI value...
Article
Full-text available
How topological defects, unavoidable at symmetry-breaking phase transitions in a wide range of systems, evolve through consecutive phase transitions with different broken symmetries remains unexplored. Nd2SrFe2O7, a bilayer ferrite, exhibits two intriguing structural phase transitions and dense networks of the so-called type II Z8 structural vortic...
Article
In this work, the dislocation etching pit morphology and etching kinetics on the A‐{112¯0} plane of sapphire crystal (α‐Al2O3) are studied experimentally. The results show that the etch pit exhibits a subrhombic 3D morphology, which is consistent with the atom arrangement symmetry of the A plane. Further analysis shows that the two adjacent sides o...
Preprint
How topological defects, unavoidable at symmetry-breaking phase transitions in a wide range of systems, evolve through consecutive phase transitions with different broken symmetries remains unexplored. Nd2SrFe2O7, a bilayer ferrite, exhibits two intriguing structural phase transitions and dense networks of the so-called type-II Z8 structural vortic...
Article
Developing materials with high biocompatibility is key to improve the artificial medical implant. Bulk metallic glasses (BMGs) based on Zr have been proposed as promising biomaterials. The present work investigated the biocompatibility of Zr46(Cu4.5/5.5Ag1/5.5)46Al8 BMG in depth by using several biomedical methods. Our results indicate that the mat...
Article
Full-text available
The influence of surface microstructural regulation mechanisms on the mechanical and giant magneto-impedance (GMI) properties of as-cast melt-extracted CoFe-based wires has been systematically researched based on morphology, phase distribution and domain structure parameters. A series of statistical models were applied to analyze the mechanical pro...
Article
Oxide spin detector materials are highly desired for emergent all-oxide spintronics. In this work, Permalloy/SrIrO3/Pb(Mg1/3Nb2/3)0.7 Ti0.3O3 (Py/SIO/PMNPT) heterostructures were prepared by pulsed laser deposition of SIO thin films epitaxially on (001)-oriented single crystalline PMNPT substrates, followed by sputter deposition of Py films upon SI...
Article
Full understanding of the ductility enhancement mechanism of bulk metallic glasses (BMGs) requires investigations of the strain field evolution under constrained load, which is still unclear in experiments to date. The present work in situ studied the strain field evolution of Zr50.7Cu28Ni9Al12.3 alloy with notch defects under three-point bending t...
Article
Techniques to fabricate patterned sapphire substrates (PSSs) have attracted much attention in recent decades. Wet etching behaviors and crystalline sapphire processes are critical for PSSs applications to improve the performance of light-emitting diodes. This study investigated the shape evolution behaviors and associated kinetics of cavities on th...
Article
Bifilm defects have been proposed to be critical for the generation of various metallurgical defects in castings and have been reported to exist in various composition-based alloys. However, the geometry structure of bifilm defects has not yet been well understood. This present work reconstructed the bifilm defects in a nickel-aluminium bronze allo...
Article
Chemical wet etching technology is widely applied in semiconductor device fabrication such as the patterned sapphire substrates. However, the etching of pre-formed structure is still lack of investigations, which has potential applications in the preparation of particular devices. By using molten KOH etchant, the present work studied the wet etchin...
Article
Full-text available
Most of the metallurgical defects in castings can be initiated by oxide bifilms reported in various alloys. However, investigations of bifilm defects in nickel-aluminium bronze castings and their fracture behaviors were absent to date, which was explored in the present work. The results showed that there are two types of defects, i.e. smooth oxide...
Article
Bifilm defects are proposed to be critical among the metallurgical defects generated in castings. However, direct investigations of individual bifilm defects separated from the casting matrix were absent to date. In this study, separated bifilm defects in nickel-aluminium bronze were investigated systematically. The results showed that an electroly...
Article
The high oxidation of aluminum alloy would result in abundant oxidation defects. In recent years, bifilm has been increasingly recognized as a source of the metallurgical defects. The crack defects in aluminum alloy casting was investigated in the present work from the viewpoint of bifilm. Computed tomography has been used to image the defects in t...
Article
We have carried out neutron diffraction and small-angle neutron scattering measurements on a high-quality single crystal of the cubic lacunar spinel multiferroic, GaV4S8, as a function of magnetic field and temperature to determine the magnetic properties for the single electron that is located on the tetrahedrally coordinated V4 molecular unit. Ou...
Preprint
Spin density waves, based on modulated local moments, are usually associated with metallic materials, but have recently been reported in insulators which display coupled magnetic and structural order parameters. We discuss one such example, the multiferroic Cu$_3$Nb$_2$O$_8$, which is reported to undergo two magnetic phase transitions, first to a s...
Article
We report upon the excellent magnetocaloric effect in melt-extracted DyHoCo medium entropy microwires. The magnetic entropy change (-ΔSM) reaches a large value of ∼11.2 J kg⁻¹ K⁻¹ for a field change (μ0ΔH) of 5 T. The large value of -ΔSM is resulted from the large magnetic moments of Dy and Ho. In addition, the DyHoCo microwires show a good cooling...
Article
Full-text available
Although stoichiometric CrTe is difficult to synthesize because of the appearance of Cr vacancies, ferromagnetic Cr1−x Te compounds have attracted increasing attention. This work investigates single crystalline (Cr0.9 B0.1)Te with the Cr vacancies filled by B to stabilize the hexagonal crystal structure and shift the Fermi energy. The structural an...
Article
Full-text available
The one-dimensional cobaltate Ca3Co2O6 is an intriguing material having an unconventional magnetic structure, displaying quantum tunneling phenomena in its magnetization. Using a newly developed experimental method, s-core-level non-resonant inelastic x-ray scattering (s-NIXS), we were able to image the atomic Co 3d orbital that is responsible for...
Article
Full-text available
Much of the dramatic growth in research on topological materials has focused on topologically protected surface states. While the domain walls of topological materials such as Weyl semimetals with broken inversion or time-reversal symmetry can provide a hunting ground for exploring topological interfacial states, such investigations have received l...
Article
Full-text available
Recently, perovskite oxide heterostructures have drawn great attention because multiple and complex coupling at the hetero-interface may produce novel magnetic and electric phenomena that are not expected in homogeneous materials either in bulks or in films. In this work, we report for the first time that an emergent giant topological Hall effect (...
Presentation
Full-text available
giving a comprehensive summaries of the electronic and magnetic properties so far we know about the typical strong spin orbit coupling materials SrIrO3 with applicaiton potential in spintronics and with prospective to open up the oxides topoligcal phases materials and physics.
Article
Full-text available
Droplet flight and solidification behaviors during twin-wire arc sprayed (TWAS) composite coatings were systematically investigated. Both theoretical model and numerical method were established for calculating the droplet deformation, breakup and solidification process in air flow based on the volume of fluid (VOF) dual-phase flow model jointed wit...
Article
The triangular lattice NaxRhO2contains a 4d Rh element with large spin-orbit coupling, and the electron-electron correlation effect is expected to have some novel physical properties. Here we report NaRhO2crystal growth by Na2CO3vapor growth and a series of NaxRhO2(0.25 ≤ x ≤ 1) crystals prepared using the chemical desodiation method. NaxRhO2reveal...
Article
Full-text available
The topology of Weyl semimetals requires the existence of unique surface states. Surface states have been visualized in spectroscopy measurements, but their connection to the topological character of the material remains largely unexplored. 1T'-MoTe2, presents a unique opportunity to study this connection. This material undergoes a phase transition...
Article
Full-text available
CaFe2O4 is an anisotropic S=52 antiferromagnet with two competing A (↑↑↓↓) and B (↑↓↑↓) magnetic order parameters separated by static antiphase boundaries at low temperatures. Neutron diffraction and bulk susceptibility measurements, show that the spins near these boundaries are weakly correlated and a carry an uncompensated ferromagnetic moment th...
Poster
Full-text available
Introducing spin orbit coupling layer to tune the attached magnetic spin moment in SrRuO 3 /SrIrO 3 superlattices;  Observed SrIrO 3 thickness dependent emergent topological Hall effect driven by interfacial Dzyaloshinskii−Moriya interactions;  Suggesting a novel strategy to manipulate spin moment, applicable in developing the spintronics.  Back...
Article
Spin orbit coupling provides a mechanism to lock the momentum of electron to its spin degree, recent years was revealed to be essential in arousing many novel physical behaviors. SrIrO3 is a typical metallic member of the strong spin orbit coupling iridate family. Its orthorhombic phase was confirmed as a particular spin orbit coupling assistant el...
Article
Topological Weyl semimetal (TWS) is a metal, where low energy excitations behave like Weyl fermions of high-energy physics. It was recently shown that due to the lower symmetry of condensed matter systems, they can realize two distinct types of Weyl fermions. The type-I Weyl fermion in a metal is formed by a linear crossing of two bands at a point...
Article
Full-text available
Heterostructure interface provides a powerful platform to explore rich emergent phenomena, such as interfacial superconductivity, nontrivial topological surface state. Here SrRuO3/SrIrO3 superlattices were epitaxially synthesized. The magnetic, and magneto-transport properties of these superlattices were characterized. Broad cusps type splitting in...
Article
By using pulsed laser deposition, Ba0.95La0.05PbO3 (BLPO) thin films with different substrate temperatures (550–750 °C) and oxygen pressures (5–20 Pa) were prepared on SrTiO3 (100) substrates. The charge valences of Ba and Pb cations in all the films are determined to be +2 and +4 by x-ray photoelectron spectroscopy. However, surface roughness of t...
Article
Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying (TWAS). The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy (SEM) and energy dispersive spectroscopy (EDS). The results showed that the obtained particle size ranged from 5 to 50 μm. The morphology of th...
Article
KxRhO2, as an isomorphism material to NaxCoO2, is theoretically predicted to have rich physical properties. In this letter, we studied the chemical depotassiation process of K0.62RhO2 crystals to obtain KxRhO2 with x varied from 0.32 to 0.62. And an end-product K0.32RhO2 with single phase determined through XRD refinement belongs to space group P63...
Article
Full-text available
Giant magneto-impedance (GMI) effect and domain transformation for melt-extracted Co68.15Fe4.35Si12.25B13.25Nb1Cu1 amorphous wires have been induced by a cryogenic Joule annealing (CJA) treatment with different DC current amplitude (0~350 mA) for 240s. Experimental results indicate that the maximum GMI ratio ([ΔΖ∕Ζ0]max) achieves to 188.1% with exc...
Article
The isothermal relaxation kinetics equations of free volume was derived based on the defect relaxation kinetics expressions. The equations were used to fit the isothermal thermal analysis curves of Al85Ni8Y5Co2 amorphous alloy at different temperature and giving out several crucial parameters associated with the structure relaxation kinetics and me...
Article
Full-text available
Combining ferroelectric with antiferromagentic materials in nanometer scale is an effective method for exploring multiferroic materials. We present two kinds of systems to show the possibility of multiferroic properties in such nanometer composites. One is the artificial superlattice LaFeO3-YMnO3, and the other is the natural layered Aurivillius ma...
Article
Full-text available
Electrical property evolution of Bi2AE2Co2O8+δ single crystals (AE = Ca, Sr and Ba) is systematically explored. When AE changes from Ca to Ba, the electrical property of Bi2Ca2Co2O8+δ and Bi2Sr2Co2O8+δ demonstrates semiconductor-like properties. But Bi2Ba2Co2O8+δ shows the metallic behavior. Analysis of temperature-dependent resistance substantiate...
Article
A series of Gd-doped Sr2IrO4single crystals were grown using a flux method. Analysis of the temper-ature-dependent resistance of these crystals reveals that these samples show two-dimensional weak localization at 150 to 300 K, while three-dimensional variable range hopping (VRH) behavior is observed at temperatures lower than 150 K. Two localizatio...
Article
We have systematically studied the microstructure and mechanical properties of Ni-5wt%Al and Ni-20wt%Al composite coatings fabricated on 6061-T6 aluminum alloy sheet by twin-wire arc spraying under different experimental conditions. The abrasive wear behavior and interface diffusion behavior of the composite coatings were evaluated by dry/wet rubbe...
Article
CaRuO3 thin films with various thicknesses were synthesized by pulsed laser deposition respectively on SrTiO3 substrates with SrO- and TiO2-termination. The microstructure of these films was studied by transmission electron microscopy. The results demonstrate that the CaRuO3 thin films grown on TiO2-terminated substrates showquite uniform morpholog...
Article
Full-text available
Single-phase KxRhO2 single crystals (x = 0.70, 0.60 and 0.50) have been grown with a spontaneous nucleation method. More potassium deficient KxRhO2 single crystals (x = 0.39 and 0.25) were also obtained by chemical de-intercalations from the as-grown crystal but two-phases exist, which is proved by an electrochemical method. Microstructure characte...
Article
Observations of the microtopography evolution on a crystallisation surface of sapphire crystal grown from Al2O3 melt show the smooth region was formed by thin atomic layers with wave-like edge trace and the rough region was mainly of aligning long bar-like structure formed by many spiral hillocks spreaded along lines corresponding to the direction...
Article
The thickness-dependent metal-insulator transition is observed in meta-stable orthorhombic SrIrO thin films synthesized by pulsed laser deposition. SrIrO films with thicknesses less than 3 nm demonstrate insulating behaviour, whereas those thicker than 4 nm exhibit metallic conductivity at high temperature, and insulating-like behaviour at low temp...
Article
Full-text available
Observations of the microtopography evolution on a crystallisation surface of sapphire crystal grown from Al<sub align="right"> 2 </sub>O<sub align="right"> 3 </sub> melt show the smooth region was formed by thin atomic layers with wave-like edge trace and the rough region was mainly of aligning long bar-like structure formed by many spiral hillock...
Article
The influence of twin-zone Joule annealing (TJA) on the microstructure and magnetic properties of melt-extracted Co68.2Fe4.3B15Si12.5 amorphous microwires has been investigated. Experimental results indicated that twin-zone Joule annealing treatment improved the GMI property of as-cast wires to a greater extent comparing with Joule annealing (JA) a...