• LI Da
    Title:professor Email: dali@imr.ac.cn
    Tel. : +86-24-83978846 FAX: +86-24-23891320
    Division: Magnetism and Magnetic Materials Division, Shenyang National Laboratory for Materials Science
    Address: Magnetism and Magnetic Materials Division, Institute of Metal Research Chinese Academy of Sciences (IMR CAS), 72 Wenhua Road, Shenyang, China, 110016

Experience:

Education Experience

Ph.D. Program: 03/2000-01/2004
Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), under the supervision of Prof. Dr. Z.D. Zhang.
Major: Materials Physics and Chemistry/Magnetism and Magnetic Materials

M.S. Program: 09/1997-03/2000
Northeastern Postgraduate Academy, Northeastern University, Shenyang, China
Major: Material Science

B.S. Program: 09/1993-07/1997
Department of nonferrous metal metallurgy, Northeastern University, Shenyang, China

Work experience

10/2011 – present
Professor, Shenyang National Laboratory for Materials Science, Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang, China.

07/201001/2011
Visiting scholar, Department of Physics, at the State University of New York at Buffalo (USA).

09/200709/2011
Research Associate, Shenyang National Laboratory for Materials Science, Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang, China.

03/200409/2007
Research Assistant,Shenyang National Laboratory for Materials Science, Institute of Metal Research (IMR), Chinese Academy of Sciences (CAS), Shenyang, China.

06/200607/2006
Visiting scholar, International Center for Theoretical Physics (ICTP), Italy.

06/200206/2003
Ph. D. candidate, Korea Institute of Machinery and Materials, South Korea.

Research Interest:

Magnetic, electrical transport and electromagnetic-wave absorption properties of functional nanomaterials; Nano-manufacturing, nanocomposites and advanced materials processing and development; Engineering of Magnetic Nanostructures for magnetic storage applications; Nanostructured Magnetic Compounds.

Research Achievement:

(1) The electronic transport properties of a composite system comprising zero dimensional superconducting NbC(C) nanocapsules and carbon nanofiber matrix were studied. The temperature dependence of electrical resistivity of the specimen pellet follows the Mott’s T−1/4 law in a temperature range between the TC of NbC and 300 K, owing to a strong degree of structural disorder in the carbon matrix. Below the TC of NbC, when the change of its electrostatic energy DE is far greater than the thermal energy, an electron will be localized on an isolated NbC nanocrystal at very low temperatures, leading to “Coulomb Blockade.” As a result, a collective behavior of the single-electron tunneling effect takes place in a three-dimensional granular superconductors’ network composed of the NbC/carbon/NbC tunneling junctions. The superconducting gap of NbC crystals is not found in the current-voltage curves, due to the suppression of surface superconductivity through the contact between NbC and carbon shells. (Phys. Rev. B 73, 193402, 2006)

(2) Electromagnetic-wave absorption by FeCo/C nanocapsules has been investigated. A reflection loss (RL) exceeding -20 dB can be obtained for all frequencies within the 2–18 GHz range by choosing an appropriate layer thickness between 1.6 and 8.5 mm. The broadest bandwidth (RL values exceeding -10 dB) from 10 to 18 GHz, covering half of the X-band and the whole Ku-band, is obtained for a 2 mm layer. Since the details of the observed weak resonance peaks in the permittivity and the permeability curves are not quite understood, it is important to establish to which extent these fine structures affect the absorption properties. The µr and er spectra were smoothed by a fifth-order polynomial fitting and the RL plots were obtained on the basis of these smoothed data. Three dimensional RL plots without and with smoothing the mr and er spectra reveals in detail the very limited influences of the fine-structures on the absorption properties. FeCo/C nanocapsules seem very attractive for application in radar-wave absorption. (Appl. Phys. Lett. 95, 023114, 2009)

(3) The hard magnetic properties of Fe3Se4 nanostructures were studied both experimentally and theoretically. Magnetic measurements showed that Fe3Se4 nanoparticles can exhibit giant coercivity exceeding 40 kOe at low temperature (10K). This unusually large coercivity is attributed to the uniaxial magnetocrystalline anisotropy of the monoclinic structure of Fe3Se4 with ordered cation vacancies. The measured anisotropy constant is 1.0×107 erg/cm3, consistent with the result from first-principles calculations. The magnetization reversal mechanism of the nanoparticles is found to be incoherent spin rotation. (Appl. Phys. Lett. 99, 202103, 2011)

Service to the International Professional Societies:

Manuscript reviewer for Crystal Growth & Design, Journal for Nanoscience and Nanotechnology (JNN) and Journal of Applied Physics.

Honors:

Publication:

(1)  H. Wang, H.H. Guo, Y.Y. Dai, D.Y. Geng, Z. Han, D. Li, T. Yang, S. Ma, W. Liu, Z.D. Zhang, Optimal electromagnetic-wave absorption by enhanced dipole polarization in Ni/C nanocapsules, Appl. Phys. Lett. 101 (8), 081337, (2012).

(2)  J.H.Wang, H.Wang, J.J.Jiang, W.J.Gong, D.Li, Q.Zhang, X.G.Zhao, S.Ma, Z.D.Zhang, Nonpolar solvothermal fabrication and electromagnetic properties of magnetic Fe3O4 encapsulated semimetal Bi nanocomposites, Crystal Growth & Design 12, 3499-3504 (2012).

(3)  J.J. Jiang, H. Wang, H.H. Guo, T. Yang, W.S. Tang, D. Li, S. Ma, D.Y. Geng, W. Liu and Z.D. Zhang,Microwave absorption properties of Ni/(C, silicides) nanocapsules, Nanoscale Res. Lett. 7, 238 (2012).

(4)  G. Long, H.W. Zhang, D. Li, R. Sabirianov, Z.D. Zhang, H. Zeng, Magnetic anisotropy and coercivity of Fe3Se4 nanostructures, Appl. Phys. Lett. 99, 202103 (2011).

(5)  H. W. Zhang, G. Long, D. Li, R. Sabirianov, and H. Zeng, Fe3Se4 Nanostructures with Giant Coercivity Synthesized by Solution Chemistry, Chem. Mater. 23, 3769 (2011).

(6)  D. Li, J.J. Jiang, W. Liu, Z.D. Zhang,Positive magnetoresistance in Fe3Se4 nanowires, J. Appl. Phys. 109, 07C705 (2011).

(7)  Z. Han, D. Li, X.W. Wang, Z.D. Zhang,Microwave response of FeCo/carbon nanotubes composites, J. Appl. Phys. 109, 07A301 (2011).

(8)  J.L. Yang, W.J. Ren, D. Li, Z.D. Zhang, Structural evolution of Ce1-xGdxFeAsO0.84F0.16 superconductors, J. Appl. Phys. 109, 07E154 (2011).

(9)  X.L. Wang, T.Y. Cui, F. Cui, Y.J. Zhang, D. Li, Z.D. Zhang,Facile access to ultrasmall Eu2O3 nanoparticle-functionalized hollow silica nanospheres based on the spontaneous formation and decomposition of a cross-linked organic/inorganic hybrid core, Chem. Commun. 47, 6329 (2011).

(10) Z. Han, D. Li, M. Tong, X. Wei, R. Skomski, W. Liu, Z.D. Zhang, Permittivity and permeability of Fe(Tb) nanoparticles and their microwave absorption in the 2-18 GHz range, J. Appl. Phys. 107, 09A929 (2010).

(11) X.L. Wang, D. Li, T.Y. Cui, P. Kharel, W. Liu, Z.D. Zhang,Magnetic and optical properties of multiferroic GdMnO3 nanoparticles, J. Appl. Phys. 107, 09B510 (2010).

(12) Z. Han, D. Li, H. Meng, X.H. Liu, Z.D. Zhang, Magnetocaloric effect in terbium diboride, J. Alloys & Comp. 498, 118-120 (2010).

(13) D. Li, C.J. Choi, Z. Han, X.G. Liu, W.J. Hu, J. Li, Z.D. Zhang,Magnetic and electromagnetic wave absorption properties of alpha-Fe(N) nanoparticles, J. Magn. Magn. Mater. 321, 4081 (2009).

(14) D. Li, Z. Han, J.G. Zheng, Z.D. Zhang, Spin canting and spin-flop transition in antiferromagnetic Cr2O3 nanocrystals, J. Appl. Phys. 106, 053913 (2009).

(15) Z. Han, D. Li, H. Wang, X.G. Liu, J. Li, D.Y. Geng and Z.D. Zhang, Broadband electromagnetic-wave absorption by FeCo/C nanocapsules, Appl. Phys. Lett. 95, 023114 (2009).

(16) Z. Han, D. Li, X.G. Liu, D.Y. Geng, J. Li and Z.D. Zhang,Microwave absorption properties of Fe(Mn)/ferrite nanocapsules, J. Phys. D: Appl. Phys. 42, 055008 (2009).

(17) Z.H. Wang, D. Li, D.Y. Geng, S. Ma, W. Liu, Z.D. Zhang,Magnetic and electronic transport properties of nanocomposites of superconducting Mo carbides' nanoparticles embedded in a ferromagnetic carbon matrix, J. Mater. Res. 24, 2229 (2009).

(18) D. Li, Z.Han, B.Wu, D.Y.Geng, Z.D.Zhang, Ferromagnetic and spin-glass behaviour of nanosized oriented pyrolytic graphite in Pb-C nanocomposites, J. Phys. D: Appl. Phys.41,115005,2008.

(19) Z.G. Chen, J.Zou, F.Li, G.Liu, D.M.Tang, D. Li, C.Liu, X.L.Ma, H.M.Cheng, G.Q.Lu, Z.D.Zhang, Growth of magnetic yard-glass shaped boron nitride nanotubes with periodic iron nanoparticles, Adv. Funct. Mater.17,3371-3376,2007.

(20) D. Li, S.Ma, W.F.Li, B.Wu, Z.D.Zhang, Disordering and the electronic transport behaviors of NbC-Al4C3-C composite, J. Mater. Sci.42,6929-6934, 2007.

(21) D. Li, Z.D.Zhang, W.F.Li, W.J.Feng, C.J.Choi, B.K.Kim, Electrical and magnetic properties of e-Fe3N nanoparticles synthesized by chemical vapor condensation process, J. Magn. Magn. Mater.307 (1),128-133, 2006.

(22) W.J.Feng, D. Li, W.J.Ren, Y.B.Li, W.F.Li, J.Li, Y.Q.Zhang, Z.D.Zhang,Glassy ferromagnetism in Ni3Sn-type Mn3.1Sn0.9, Phys. Rev. B73,205105, 2006.

(23) D.Li, W.F.Li, S.Ma, Z.D.Zhang, Electronic transport properties of NbC(C)-C nanocomposites, Phys. Rev. B73,193402,2006.

(24) P.Z.Si, D.Li, J.W.Lee, C.J.Choi,Z.D.Zhang,D.Y.Geng, E.Bruck, Unconventional exchange bias in oxide-coated manganese nanoparticles, Appl. Phys. Lett.87 (13),133122, 2005.

(25) D.Li, D.Y.Geng, Y.T.Xing, W.F.Li, G.W.Qiao, Y.Z.Wang, Z.D.Zhang, Metal-nonmetal transition and the electronic transport behavior in disordered PbO2-Ag2O-xC system synthesized by ball milling, J. Mater. Sci. 40 (5),1087-1091, 2005.

(26) D.Li, C.J.Choi, J.H.Yu, B.K.Kim, Z.D.Zhang, Nanocrystalline a-Fe and e-Fe3N particles prepared by chemical vapor condensation process, J. Magn. Magn. Mater.283 (1),8-15,2004.

(27) D.Li, C.J.Choi, B.K.Kim, Z.D.Zhang, Characterization of Fe/N nanoparticles synthesized by the chemical vapor condensation process, J. Magn. Magn. Mater.277 (1-2),64-70, 2004.

(28) D.Li, Z.D.Zhang, D.Y.Geng, W.F.Li, X.P.Song, G.W.Qiao, Y.Z.Wang, Phase transformation and percolation effect in PbO2-1/12Ag2O-xC system, Solid State Commun.125 (9),493-497,2003.

(29) D.Li, Z.J.Xu, Z.H.Wang, D.Y.Geng, J.S.Zhang, Z.D.Zhang, G.L.Yuan, J.M.Liu, Synthesis and characterization of M-Cl (M-Fe, Co, Ni) boracites, J. Alloys & Compounds351(1-2),235-240,2003.

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