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Spontaneous liquid crystal and ferromagnetic ordering of colloidal magnetic nanoplates

Author

Listed:
  • M. Shuai

    (University of Colorado)

  • A. Klittnick

    (University of Colorado)

  • Y. Shen

    (University of Colorado)

  • G. P. Smith

    (University of Colorado)

  • M. R. Tuchband

    (University of Colorado)

  • C. Zhu

    (Advanced Light Source, Lawrence Berkeley National Laboratory)

  • R. G. Petschek

    (Case Western Reserve University)

  • A. Mertelj

    (Jozef Stefan Institute)

  • D. Lisjak

    (Jozef Stefan Institute)

  • M. Čopič

    (Jozef Stefan Institute
    Faculty of Mathematics and Physics, University of Ljubljana)

  • J. E. Maclennan

    (University of Colorado)

  • M. A. Glaser

    (University of Colorado)

  • N. A. Clark

    (University of Colorado)

Abstract

Ferrofluids are familiar as colloidal suspensions of ferromagnetic nanoparticles in aqueous or organic solvents. The dispersed particles are randomly oriented but their moments become aligned if a magnetic field is applied, producing a variety of exotic and useful magnetomechanical effects. A longstanding interest and challenge has been to make such suspensions macroscopically ferromagnetic, that is having uniform magnetic alignment in the absence of a field. Here we report a fluid suspension of magnetic nanoplates that spontaneously aligns into an equilibrium nematic liquid crystal phase that is also macroscopically ferromagnetic. Its zero-field magnetization produces distinctive magnetic self-interaction effects, including liquid crystal textures of fluid block domains arranged in closed flux loops, and makes this phase highly sensitive, with it dramatically changing shape even in the Earth’s magnetic field.

Suggested Citation

  • M. Shuai & A. Klittnick & Y. Shen & G. P. Smith & M. R. Tuchband & C. Zhu & R. G. Petschek & A. Mertelj & D. Lisjak & M. Čopič & J. E. Maclennan & M. A. Glaser & N. A. Clark, 2016. "Spontaneous liquid crystal and ferromagnetic ordering of colloidal magnetic nanoplates," Nature Communications, Nature, vol. 7(1), pages 1-8, April.
    • Handle: RePEc:nat:natcom:v:7:y:2016:i:1:d:10.1038_ncomms10394
    DOI: 10.1038/ncomms10394
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