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Applied Physics Letters / Volume 100 / Issue 6 / PHOTONICS AND OPTOELECTRONICS

Appl. Phys. Lett. 100, 061117 (2012); http://dx.doi.org/10.1063/1.3683540 (4 pages)

Resonant magnetic response of TiO2 microspheres at terahertz frequencies

H. Němec1, C. Kadlec1, F. Kadlec1, P. Kužel1, R. Yahiaoui2, U.-C. Chung3,4, C. Elissalde3, M. Maglione3, and P. Mounaix2

1Institute of Physics, Academy of Sciences of the Czech Republic, Na Slovance 2, 182 21 Prague 8, Czech Republic
2Laboratoire Ondes et Matière d’Aquitaine (LOMA), Université Bordeaux 1, UMR CNRS 5798, 351 Cours de la Libération, 33405 Talence, France
3Institut de Chimie de la Matière Condensée de Bordeaux (ICMCB), CNRS—UPR9048, 87 Avenue du Docteur Albert Schweitzer, 33608 Pessac, France
4Centre de Recherche Paul Pascal—CNRS, Université Bordeaux, 115 Avenue du Dr A. Schweitzer, 33608 Pessac, France

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(Received 2 December 2011; accepted 20 January 2012; published online 9 February 2012)

Spray-drying technique is used to fabricate spherical microparticles out of dissolved TiO2 nanoparticles. We show both experimentally and through numerical calculations that the microspheres support a Mie resonance, leading to an effective magnetic response. For this purpose, nearly single layers of microspheres were prepared and characterized by time-domain terahertz spectroscopy. We developed an experimental approach allowing simultaneous measurement of complex transmittance and reflectance of a thin layer, which in turn enables evaluation of its effective dielectric permittivity and effective magnetic permeability. Numerical finite-element-method calculations of the electromagnetic response show that the prepared microparticles are suitable for preparing a metamaterial with negative effective magnetic permeability.

© 2012 American Institute of Physics

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KEYWORDS, PACS, and IPC

Keywords

drying, finite element analysis, magnetic particles, magnetic permeability, nanofabrication, nanomagnetics, nanoparticles, permittivity, spraying, terahertz wave spectra, titanium compounds

PACS

  • 81.07.Bc

    Nanocrystalline materials

  • 78.70.Gq

    Microwave and radio-frequency interactions

  • 75.60.Ej

    Magnetization curves, hysteresis, Barkhausen and related effects

  • 75.50.Tt

    Fine-particle systems; nanocrystalline materials

  • 75.75.Cd

    Fabrication of magnetic nanostructures

  • 77.22.Ch

    Permittivity (dielectric function)

International Patent Classification (IPC)

  • B82B1/00

    Nano-structures

  • B82B3/00

    Manufacture or treatment of nano-structures

  • H01F1/00

    Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties

  • F26B

    Drying solid materials or objects by removing liquid therefrom

  • B05

    Spraying or atomising in general; Applying liquids or other fluent materials to surfaces, in general

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.3683540

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    K. Vynck, D. Felbacq, E. Centeno, A. I. Cabuz, D. Cassagne, and B. Guizal, Phys. Rev. Lett. 102, 133901 (2009).

    H. Němec, P. Kužel, F. Kadlec, C. Kadlec, R. Yahiaoui, and P. Mounaix, Phys. Rev. B 79, 241108 (2009).

    D. R. Smith, S. Schultz, P. Markoš, and C. M. Soukoulis, Phys. Rev. B 65, 195104 (2002).

    A. Pashkin, M. Kempa, H. Němec, F. Kadlec, and P. Kužel, Rev. Sci. Instrum. 74, 4711 (2003)RSINAK000074000011004711000001.


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