A5017328454- Magnetic and transport properties of perovskites and related materials
- Magnetic Properties of Alloys
- Rare-earth and actinide compounds
- Advanced Condensed Matter Physics
- Shape Memory Alloy Transformations
- Magnetic properties of thin films
- Multiferroics and related materials
- Electronic and Structural Properties of Oxides
- Thermal Expansion and Ionic Conductivity
- Ferroelectric and Piezoelectric Materials
- Magnetic Properties and Applications
- Advanced Thermoelectric Materials and Devices
- Heusler alloys: electronic and magnetic properties
- Magnetic Properties and Synthesis of Ferrites
- Physics of Superconductivity and Magnetism
- High Entropy Alloys Studies
- Semiconductor materials and devices
- Metallic Glasses and Amorphous Alloys
- Atomic and Subatomic Physics Research
- Inorganic Chemistry and Materials
- High-pressure geophysics and materials
- Advancements in Solid Oxide Fuel Cells
- Hydrogen Storage and Materials
- Ferroelectric and Negative Capacitance Devices
- Optical properties and cooling technologies in crystalline materials
Chinese Academy of Sciences
2016-2025
Institute of Physics
2016-2025
University of Chinese Academy of Sciences
2017-2025
Songshan Lake Materials Laboratory
2018-2025
National Laboratory for Superconductivity
2010-2025
Powerchina Huadong Engineering Corporation (China)
2024-2025
Czech Academy of Sciences, Institute of Physics
2002-2025
Physical Sciences (United States)
2025
ZheJiang Academy of Agricultural Sciences
2025
State Key Laboratory of Magnetism
2015-2024
Magnetization of the compound LaFe11.4Si1.6 with cubic NaZn13-type structure was measured as functions temperature and magnetic field around its Curie TC ∼208 K. It is found that phase transition at completely reversible. Magnetic entropy change ΔS, allowing one to estimate magnetocaloric effect, determined based on thermodynamic Maxwell relation. The achieved magnitude |ΔS| reaches 19.4 J/kg K under a 5 T, which exceeds most other materials involving reversible in corresponding range. large...
Abstract The magnetic refrigeration technique based on the magnetocaloric effect (MCE) has attracted increasing interest because of its high efficiency and environment friendliness. In this article, our recent progress in exploring effective MCE materials is reviewed with emphasis LaFe 13− x Si based alloys discovered by us. These show large entropy changes over a wide temperature range near room temperature. effects rare‐earth doping, interstitial atoms pressure have been systematically...
A considerable magnetic entropy change has been observed in Ni51.5Mn22.7Ga25.8 alloys under a field of 0.9 T. This originates from sharp magnetization jump which is associated with martensitic to austenitic structure transition. The large low and the adjustable martensic–austensic transition temperature indicate great potential Ni–Mn–Ga as working materials for refrigerants wide range.
Here, we report on the experimental discovery of biskyrmion magnetic nanodomains at RT and observation a biskyrmion-derived topological Hall effect (THE) in centrosymmetric hexagonal MnNiGa magnet. Using phase reconstruction technique based transport-of-intensity equation (TIE), established texture spin. Results from Lorentz transmission electron microscopy (TEM) revealed that is stable over much wider temperature range (100 K to ~340K) larger field our material than skyrmion-hosting bulk...
MnCoGe-based compounds undergo a giant negative thermal expansion (NTE) during the martensitic structural transition from Ni2In-type hexagonal to TiNiSi-type orthorhombic structure. High-resolution neutron diffraction experiments revealed that of unit cell volume can be as large ΔV/V ∼ 3.9%. The optimized compositions with concurrent magnetic and transitions have been studied for magnetocaloric effect. However, these materials not considered NTE partially due limited temperature window phase...
A large magnetic entropy change $|\ensuremath{\Delta}S|$ has been observed in Heusler alloy ${\mathrm{Ni}}_{52.6}{\mathrm{Mn}}_{23.1}{\mathrm{Ga}}_{24.3}$ single crystal near the martensitic structural transition temperature of 300 K with applied field along [001] direction. The obtained under an 5 T reaches 18.0 J/Kg (corresponding 146 mJ/${\mathrm{cm}}^{3}$ K). more important result is that can achieve constant increase 4.0 for every tesla. very attributed to abrupt magnetization when...
Entropy changes in the compounds of La1−xPrxFe11.5Si1.5 (x=0.3 and 0.4) have been experimentally studied. A tower-shaped entropy change height ∼27J∕kgK is obtained based on analyses heat capacity, while Maxwell relation predicts an extra peak ∼99J∕kgK, slightly varying with Pr content. careful study indicates that cannot be used vicinity Curie temperature because coexistence paramagnetic ferromagnetic phases, huge a spurious result. Similar conclusions are applicable to MnAs Mn1−xFexAs, for...
A very large magnetic entropy change ΔS has been observed in Fe-based cubic NaZn13-type compound LaFe11.2Co0.7Si1.1 near the Curie temperature TC of 274 K. The value is ∼20.3 J/kg K under a field 5 T at TC=274 It markedly exceeds that pure Gd corresponding range [V. Pecharsky & A. Gschneidner, Jr., Phys. Rev. Lett. 78, 4494 (1999)]. great produced by sharp magnetization associated with negative lattice expansion TC. and low cost suggest potential for applications as refrigerants room temperature.
Magnetic properties and magnetocaloric effects (MCEs) of ternary intermetallic ErFeSi compound have been investigated in detail. It is found that exhibits a second-order magnetic transition from ferromagnetic to paramagnetic states at the Curie temperature TC = 22 K, which quite close liquid hydrogen (20.3 K). A thermomagnetic irreversibility between zero-field-cooling field-cooling curves observed below low field, it attributed narrow domain wall pinning effect. For field change 5 T,...
The magnetic properties and magnetocaloric effect (MCE) of antiferromagnetic HoCuSi compound have been studied. It is found that undergoes a field-induced first order metamagnetic transition from (AFM) to ferromagnetic (FM) states below the Néel temperature (TN). A giant MCE without hysteresis loss observed in around TN. maximal entropy change (−ΔSM) refrigerant capacity are 33.1 J/kgK 385 J/kg, respectively, for field 0–5 T. excellent can result AFM-FM TN increase magnetization caused by...
Abstract The most widespread cooling techniques based on gas compression/expansion encounter environmental problems. Thus, tremendous effort has been dedicated to develop alternative technique and search for solid state materials that show large caloric effects. An application of pressure a material can cause change in temperature, which is called the barocaloric effect. Here we report giant effect hexagonal Ni 2 In-type MnCoGe 0.99 In 0.01 compound involving magnetostructural...
Two-dimensional electron gases (2DEGs) at oxide interfaces, which provide unique playgrounds for emergent phenomena, have attracted increasing attention in recent years. While most of the previous works focused on 2DEGs LaAlO_{3}/SrTiO_{3} here we report a new kind formed between magnetic insulator EuO and high-k perovskite KTaO_{3}. The are not only highly conducting, with maximal Hall mobility 111.6 cm^{2}/V s 2 K, but also well spin polarized, showing strongly hysteretic magnetoresistance...
We present herein a systematic study of polycrystalline magnetocaloric compound ErFe2Si2. It exhibits transition from the antiferromagnetic to paramagnetic phase around 3.0 K according magnetic and heat capacity measurements. Neutron powder diffraction revealed that ErFe2Si2 possesses superlattice structure with propagation vector (0, 0, 0.5). The can be modeled by transverse spin density wave (cosine-modulated) or spiral type, which cannot distinguished solely neutron (NPD) pattern fitting....
Abstract Magnetic refrigeration technology can achieve higher energy efficiency based on the magnetocaloric effect (MCE). However, practical application of MCE materials is hindered by their poor mechanical properties, making them challenging to process into devices. Conventional strengthening strategies usually lead a trade‐off with capacity reduction. Here, novel design presented overcome this dilemma forming dual‐phase alloys through in situ precipitation tough magnetic phase within an...
As a low-carbon and energy-efficient refrigeration approach, barocaloric is considered promising alternative to traditional vapor compression refrigeration. However, finding excellent materials remains significant challenge, as they...
Orbitronics provides novel mechanisms to generate terahertz (THz) emission using the orbital angular momentum of electrons. Here, we report a systematic investigation THz from <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mrow><a:mi mathvariant="normal">Ni</a:mi><a:mtext>/</a:mtext><a:mi>Cu</a:mi><a:msub><a:mi mathvariant="normal">O</a:mi><a:mi>x</a:mi></a:msub></a:mrow></a:math> heterostructures pumped by femtosecond laser pulse. Despite very weak spin-orbit coupling <d:math...
Adiabatic demagnetization refrigeration (ADR) offers a compelling alternative to traditional ultra-low temperature technologies by eliminating the reliance on scarce 3He and gravitational constraints. The key of ADR development is find magnetic refrigerants with exceptional magnetocaloric properties. In this study, polycrystalline CsEuCl3 CsEuBr3 halide perovskites were synthesized simple solid-phase reaction method. crystallizes in tetragonal structure, while forms an orthorhombic both...
Intermetallic compound ErGa exhibits two successive magnetic transitions: spin-reorientation transition at TSR=15 K and ferromagnetic-paramagnetic TC=30 K. Both transitions contribute greatly to the entropy change (ΔSM), each yielding a significant peak on their ΔSM-T curve thus considerable value of refrigerant capacity (RC) without hysteresis loss. For field 5 T, maximal values −ΔSM are 21.3 J/kg TC 16.5 TSR, with an RC 494 J/kg. Large reversible magnetocaloric effect indicate potentiality...
Bonded La(Fe, Si)13 magnetic refrigeration materials have been prepared, and the microstructure, mechanical properties, magnetocaloric effect (MCE) of bonded LaFe11.7Si1.3C0.2Hx investigated systematically. show porous architecture, properties increase with epoxy resin content, which could fill more pores boundaries thus enhance binding force between different particles. LaFe11.7Si1.3C0.2H1.8 3 wt. % exhibits a compressive strength 162 MPa, 35% higher than that bulk compound. The mass...
Magnetic properties and magnetocaloric effect (MCE) of intermetallic RFeSi (R = Tb Dy) compounds have been investigated systematically. The undergo a second-order magnetic transition from ferromagnetic to paramagnetic states with the variation temperature. Curie temperatures determined magnetization measurements are 110 K 70 for TbFeSi DyFeSi, respectively, which quite close liquefaction natural gas (111 K) nitrogen (77 K). Both exhibit nearly same large MCE around their respective ordering...
Grouping different transition metal oxides together by interface engineering is an important route toward emergent phenomenon. While most of the previous works focused on effects in perovskite/perovskite heterostructures, here we reported a symmetry mismatch-driven spin reorientation perpendicular magnetic anisotropy perovskite/brownmillerite which scarcely seen tensile heterostructures. We show that alternately stacking perovskite La2/3Sr1/3MnO3 and brownmillerite LaCoO2.5 causes strong...
In this work, we review three models of magnetic ordering in typical materials that have been proposed based on atomic physics. The first model discuss is the O 2p itinerant electron for oxides, which called IEO model. Using model, structures spinel ferrites MFe2O4, where M = Ti, Cr, Mn, Fe, Co, Ni, or Cu, and perovskite manganites La1−xSrxMnO3, 0.0≤x≤0.4, can be explained. second considered a new metals, IEM employed to explain relation between average moment per atom resistivity Co metals....