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Professor Juan DU

 Personal Details
Telephone: +86 (0)574 8668 5150
E-mail: dujuan@nimte.ac.cn
Address: Department of Magnetic Materials and Advanced Devices
Ningbo Institute of Materials Technology &. Engineering,
Chinese Academy of Sciences
519 Zhuangshi Street, Zhenhai District
Ningbo, Zhejiang
• 2010.7-now Full Professor at Ningbo Institute of Material Technology and Engineering, Chinese Academy of Sciences(CAS), Ningbo, China.
• 2009.2- 2010.7 Postdoctoral at Case Western Reserve University, Cleveland, USA.
• 2007.11-2008.10 Postdoctoral at Delft University of Technology, Delft, the Netherlands.
• 2004.8-2007.11 Ph.D at Institute of Metal Research, CAS, Shenyang, China
• 1994-1998, 2001-2004 Bachelor and Master at Central South University, Changsha, China.
Research Interests
My core research interests and also my current work lie in
 Synthesis, fundamental study of magnetic nanoparticles,
 High efficiency energy materials such as permanent magnets, magnetocaloric effect materials, including “Bottom Up” method approach to the next generation of super high performance permanent magnets; green refrigeration magnetorefrigeration technique.
 Application study of magnetic nanoparticles on biomedicine, biosensor et.al.
Current Research
Topic1 synthesis of magnetic nanoparticles by Chemical and Physical method.
From fundamental study to potential application, size、shape and magnetic properties control synthesis of magnetic nanoparticles becomes a very important issue. We use Chemical method such as high temperature decomposition and sol gel method to synthesis Fe\FeCo\NiFe\FePt et.al magnetic nanoparticles. Synthesis of self assembly special structure such as core-shell, heterogeneous nanoparticles is our another important research field. For some poor stable alloys, such as Rare Earth –Transitional metal alloys, it has severe difficulties in chemical method synthesis. We use surfactant assisted high energy ball milling to prepare rare earth permanent nanoparticles.
Topic 2 High performance permanent magnets.
High performance magnets are currently being used for many military and commercial applications. As the requirement of energy saving and low emmission, the demands of electric/hybrid vehicles and wind turbines grow rapidly where these magnets are greatly needed. The strength of a magnet is determined by the value of the maximum energy product, (BH)max. The higher the (BH)max is, the smaller is the volume of the magnet needed for an application. Our recent research is using the bottom-up approach to prepare anisotropic nanocomposites, where magnetically hard and soft nanoparticles are prepared and assembled together and then compacted to form a textured nanocomposite magnet. The development of super-strong magnets will lead to smaller, lighter and more efficient devices.
Topic 3 Research on the high efficient energy materials.
Modern society relies on readily available refrigeration. Compared to tradition compressor-based refrigeration, Magnetic refrigeration has prominent advantages such as high energy efficiency, no harmful gasses involved, smaller devices because of solid working materials, low noise, et.al. Good magnetic refrigerant materials should have large magnetocaloric effect, low hysteresis loss, high refrigeration capacity powder. Metal Gd is used in most magnetorefrigeration prototype. Materials with preferable magnetorefrigeration properties are strongly demanded for commercial use. Our research is to search for new ideal materials, and also to design/tailor discovered magnetic refrigerant-materials to meet the requirements for commercial use.
I collaborate widely with a range of colleges and institutes locally, nationally and internationally. My other principal collaborators include:
Prof. Dr. ZD Zhang, and director of magnetism and magnetic materials division at Institute of Metal Research, CAS.
Prof. Dr. Ekkes Brück, and head of section Fundamental Aspects of Energy and Materials at Delft University of Technology, the Netherlands
Prof. Dr. Xuan Gao, at department of physics, Case Western Reserve University, USA.
• 1.Liang D, Du J, and Gao X.P.A, “Anisotropic Magneto-conductance of InAs Nanowire: Angle Dependent Suppression of 1D Weak Localization.” Phys.Rev.B. 81(15)153304 (2010)
• 2. Juan Du, Dong Liang, Hao Tang and Xuan P.A. Gao., “InAs Nanowire Transistors as Gas Sensor and the Response Mechanism”. Nano Lett. 9 (12) 4348 (2009)
• 2. Liang D, Du J, and Gao X.P.A, “Anisotropic Magneto-conductance of InAs Nanowire: Angle Dependent Suppression of 1D Weak Localization.” Submitted to Phys.Rev.B. Dec. 2009.
• 3. J. Du, W. B. Cui, Q. Zhang, S. Ma, D. K. Xiong, and Z. D. Zhang. “Giant magnetocaloric effect in ε-(Mn0.83Fe0.17)3.25Ge antiferromagnet” Appl. Phys. Lett. 90 (4), 042510 (2007).
• 4. Juan Du, Da Li, Yao Biao Li, Nai Kun Sun, Ji Li, and Zhi Dong Zhang, “Abnormal magnetoresistance in ε-(Mn1-xFex)3.25Ge antiferromagnets”. Phys. Rev. B, 76 (9), 094401 (2007).
• 5. J. Du, Q. Zheng, W. J. Ren, W. J. Feng, X. G. Liu, Z. D. Zhang. “Magnetocaloric effect and magnetic - field - induced shape recovery effect at room temperature in ferromagnetic Heusler alloy Ni-Mn-Sb” J. Phys. D: Appl. Phys. 40 (18), 5523 (2007).
• 6. J. Du, Q. Zheng, Y. B. Li, Q. Zhang, D. Li and Z. D. Zhang. “Large magnetocaloric effect and enhanced magnetic refrigeration in ternary Gd-based bulk metallic glasses”. J. Appl. Phys. 103 (2), 023918 (2008).
• 7. J. Du, Q. Zheng, E. Bruck, K. H. J. Buschow, W. B. Cui, W. J. Feng, Z. D. Zhang. “Spin-glass behavior and magnetocaloric effect in Tb-based bulk metallic glass”. J. Magn. Magn. Mater. 321 (5), 413 (2009).
• 8. W. J. Hu, J. Du, B. Li , Q. Zhang , Z. D. Zhang. “Giant magnetocaloric effect in DySb Ising antiferromagnet”. Appl. Phys. Lett. 92 (19), 192505 (2008).
• 9. B. Li, J. Du, W. J. Hu, Q. Zhang, D. Li, Z. D. Zhang, “Large reversible magnetocaloric effect in Tb3Co compound”. Appl. Phys. Lett. 92 (24), 242504 (2008).
• 10. Feng, WJ; Du, J; Li, B, et al. “Large low-field inverse magnetocaloric effect in Ni50-xMn38+xSb12 alloys”. J. Phys. D: Appl. Phys. 42 (12), 125003 (2009)