Browsing J. Ping Liu, Ph.D. by Author "Nandwana, Vikas"

Now showing items 1-8 of 8

    • Bimagnetic nanoparticles with enhanced exchange coupling and energy products 

      Nandwana, Vikas; Chaubey, Girija Shankar; Yano, Kazuaki; Rong, Chuan-Bing; Liu, J. Ping (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2009-01-06)
      Bimagnetic FePt/Fe3O4 nanoparticles with core/shell or heterodimer structure have been prepared using a sequential synthetic method. The dimension of both FePt and Fe3O4 was tuned by varying the synthesis parameters. The ...

    • Bulk FePt-based nanocomposite magnets with enhanced exchange coupling 

      Rong, Chuan-Bing; Nandwana, Vikas; Poudyal, Narayan; Liu, J. Ping; Kozlov, Mikhail E.; Baughman, Ray H.; Ding, Yong; Wang, Zhong Lin (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2007-07-23)
      High density bulk FePt/Fe3Pt nanocomposite magnets have been prepared by high-pressure warm compaction of chemically synthesized FePt and Fe3O4 nanoparticles. It is found that the density increases with the compaction ...

    • Bulk FePt/Fe3Pt nanocomposite magnets prepared by spark plasma sintering 

      Rong, Chuan-Bing; Nandwana, Vikas; Poudyal, Narayan; Liu, J. Ping; Saito, Tetsuji; Wu, Yaqiao; Kramer, Matthew J. (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2007-04-27)
      FePt/Fe3Pt bulk nanocomposite magnets have been prepared by the spark plasma sintering of chemically synthesized FePt and Fe3O4 nanoparticles under 100 MPa at 400–600 °C. It was found that the phase transition of the FePt ...

    • High thermal stability of carbon-coated L1[subscript]0-FePt nanoparticles prepared by salt-matrix annealing 

      Rong, Chuan-Bing; Poudyal, Narayan; Chuabey, Girija S.; Nandwana, Vikas; Liu, Yuzi; Wu, Y.Q.; Kramer, Matthew J.; Kozlov, Mikhail E.; Baughman, Ray H.; Liu, J. Ping (Institute of Applied PhysicsDepartment of Physics, The University of Texas at Arlington, 2008-02-08)
      Monodisperse L10-FePt nanoparticles with size ranging from 3 to 8 nm were prepared by the salt-matrix annealing method. It was observed that the annealed particles have high thermal stability—no sintering occurred even ...

    • Phase Transformation and Magnetic Hardening in Isolated FePt Nanoparticles 

      Liu, J. Ping; Rong, Chuan-Bing; Nandwana, Vikas; Poudyal, Narayan; Chaubey, Girija Shankar (IEEEDepartment of Physics, The University of Texas at Arlington, 2009-03-31)
      Isolated monodisperse L1[subscript]0 FePt nanoparticles coated by carbon were obtained by adding enough surfactants that decomposed into carbon after the chemical synthesis and postannealing of the A1 FePt nanoparticles. ...

    • Phase Transformation and Magnetic Hardening in Isolated FePt Nanoparticles 

      Liu, J. Ping; Rong, Chuan-Bing; Nandwana, Vikas; Poudyal, Narayan; Chaubey, Girija S. (IEEE XploreIEEEDepartment of Physics, The University of Texas at Arlington, 2009-07)
      Isolated monodisperseL10 FePt nanoparticles coated by carbon were obtained by adding enough surfactants that decomposed into carbon after the chemical synthesis and postannealing of the A1 FePt nanoparticles. The effect ...

    • Rapid thermal annealing of FePt nanoparticles 

      Yano, Kazuaki; Nandwana, Vikas; Poudyal, Narayan; Rong, Chuan-Bing; Liu, J. Ping (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2008-07-11)
      We report a systematic study on rapid thermal annealing (RTA) of FePt nanoparticles. FePt particles with an average size of 8 nm were synthesized by a chemical solution method, and then annealed using RTA and conventional ...

    • Structural phase transition and ferromagnetism in monodisperse 3 nm FePt particles 

      Rong, Chuan-Bing; Poudyal, Narayan; Chaubey, Girija Shankar; Nandwana, Vikas; Skomski, R.; Wu, Y.Q.; Kramer, Matthew J.; Liu, J. Ping (American Institute of PhysicsDepartment of Physics, The University of Texas at Arlington, 2007-08-30)
      FePt nanoparticles with a size of 3 nm and thermally stable room-temperature ferromagnetism are investigated. The monodisperse nanoparticles were prepared by chemical synthesis and a salt-matrix annealing technique. ...