磁学国家重点实验室 M03 组
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Research Proposal of Group M03 (2023-2025) |
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Proposer: Fengxia Hu Members: Prof. Baogen Shen, Prof. Yunzhong Chen, Dr. Jing Wang, Dr. Zhihong Wang, Dr. Yuansha Chen, Mr. Ming Hu, Prof. Fengxia Hu, Prof. Jirong Sun(rehire), Dr. Zhiyi Xu(Ganjiang institute) (7+1+1 people) =================================================== 1. Scientific significance of research A key issue for matter science is the discovery of new scientific laws and new materials. The designing and fabrication of artificial materials/devices has been a tendency of recent condensed matter physics. With the help of advanced technologies, we hope to design/fabricate novel materials/devices by grouping spin, orbital, charge, and lattice to explore novel scientific effects and laws. The present proposal includes: (1) Thermal effects associated with the variation of spin and lattice order and multifield regulating: Thermal effects associated with various order-disorder phase transitions, especially the regulation under magnetic field, various strain, and electric field, and the underlying physics for magnetocaloric/barocaloric/elastocaloric effects. (2) Multi-filed regulation of magnetic state: Transport behavior of spin polarized electron and spin torque effect, electro-resistance effect and its correlation with interfacial structure, exploration for materials/devices with novel functions. (3) Low-dimensional magnetism and spin-related processes: Quantum effect, proximity effect, interface/surface effect of ultrathin films/multilayers and various hetero-structures of complex oxides that own the characters of strong electron correlation and multi-degrees of freedom. In summary, these activities will focus on the designing of novel materials/devices at atomic even electronic level, and are therefore worthwhile for pushing forward the exploration of novel materials, new information carriers, and new regulation approaches. 2. Research plan and expected outcome Research plan (1) Caloric effects associated with the variation of spin and lattice order and multifield regulating, the underlying physics of magnetocaloric/barocaloric/elastocaloric effect and permanent magnetism, the scientific and technologic bases for the fabrication of R-Fe-B rare-earth permanent magnets and ferrite permanent magnets with excellent performance based on big data model construction. (2) Design and fabrication of ultrathin films/superlattices/heterostructures from the magnetic oxides/compounds that own distinctive spin structure, coupled degrees of freedom and competitive mechanisms, focusing on novel magnetic states with the emergent phenomena associated with interlayer coupling, quantum size effect, proximity effect, and their multi-field regulation. (3) Rare-earth based magnetic topological materials: Design a new class of rare-earth based magnetic topological materials with large anomalous Nernst effect, where the electronic structure to locate the Weyl points near the Fermi energy is crucial to enhance the Berry curvature. Moreover, advance the mechanisms behind the large transverse thermo-electric effect and their application. Via these researches, we hope to reveal the distinct effects of spin, orbital, charge and lattice coupling on the spin/charge transport behaviors, on the magnetic-electric interplay, and on the magnetocaloric/barocaloric/elastocaloric properties of the materials, establishing a clear relation between different degrees of freedom and multi-field manipulation of the physics processes and, finally, making substantial advances in the exploration of novel magneto-electric, magneto-caloric, and permanent magnetic materials. Expected outcome Through these researches we hope to (1) make significant progress in the exploration for novel magneto-electric, magneto-caloric, and magneto-optical materials/devices, gaining future-oriented materials, new information carriers, and novel regulation approaches; (2) reveal the influence of electron-correlation/quantum-effect on spin/charge transport, magnetic-electric coupling, and magnetocaloric effect. 3．Research experience and facilities Research experience：There has been more than 50 years since the establishment of M03 group. In recent years, we achieved lots of results with important international impact under support of the National Key R&D Program of China from the Ministry of Science and Technology of China, the key projects of the National Natural Science Foundation of China, key projects of the Chinese Academy of Science. We not only discovered the novel magnetocaloric material, but also open up a new way for the study of basic theory and the exploration of new materials. Moreover, we also got important progress in the field of complex oxide magnetoelectric properties. For example: discovered electric/magnetic phase separation in perovskite manganites, firstly reported an unusual illumination-enhanced gating effect in a two-dimensional electron gas at the LaAlO3/SrTiO3 interface. Our research achievements have won Tan Kah Kee Science Awards in 2014, the second prize of the National Natural Science Award of China in 2012, and the first prize of the Science and Technology Award of Beijing in 2010. The present proposal is the continuing of the original one “Exploration and multifield regulating of novel magnetic materials”. In the past three years, we have systematically investigated magnetocaloric/barocaloric effect and realized significant enhancements of caloric performance by multifield regulation. Moreover, novel superconductivity was discovered at the interface of high dielectric 5d oxide KTaO3, and circular photogalvanic effect was obtained for the first time in LaAlO3/SrTiO3 interface two-dimensional electronic liquid. All these lay a firm foundation for further work. Facilities：The M03 group has complete facilities for preparing and charactering bulk and thin films through the accumulation of years of work, including: 1 system for controllable fabrication and in situ analysis of the complex oxide thin film/multi-layers, which joins the techniques of pulsed laser deposition(PLD), advanced RHEED monitoring and AFM/STM analyzing, and the mask technique for sample growth; 3 normal PLD systems for preparing films; 2 magnetron sputtering system; 1 arc melting furnace; 1 melt spinner; 1 Spark Plasma Sintering(SPS) system；Several vacuum annealing furnaces; 1 SQUID-VSM(1.8~400 K, 7 T)；1 Lakeshore-VSM(300K~1273 K, 2 T)；1 Crogenic low temperature and high magnetic field measurement system; 1 new set of scanning Hall Probe Microscope and Low temperature/high magnetic field compatible KPFM microscope (attoSHPM-KPFM, 2-300K, 0-9T); 1 new TSST pulsed laser deposition (PLD) with laser heating; 1 new Surface PLD workstation with glove box and environment thermal annealing. |
