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Hard magnetic ferrite with a gigantic coercivity and high frequency millimetre wave rotation

Author

Listed:
  • Asuka Namai

    (School of Science, The University of Tokyo)

  • Marie Yoshikiyo

    (School of Science, The University of Tokyo)

  • Kana Yamada

    (School of Science, The University of Tokyo)

  • Shunsuke Sakurai

    (School of Science, The University of Tokyo)

  • Takashi Goto

    (Dowa Electronics Materials Co., Ltd.)

  • Takayuki Yoshida

    (Dowa Electronics Materials Co., Ltd.)

  • Tatsuro Miyazaki

    (Dowa Electronics Materials Co., Ltd.)

  • Makoto Nakajima

    (Institute for Solid State Physics, The University of Tokyo)

  • Tohru Suemoto

    (Institute for Solid State Physics, The University of Tokyo)

  • Hiroko Tokoro

    (School of Science, The University of Tokyo)

  • Shin-ichi Ohkoshi

    (School of Science, The University of Tokyo
    CREST, JST, K's Gobancho)

Abstract

Magnetic ferrites such as Fe3O4 and Fe2O3 are extensively used in a range of applications because they are inexpensive and chemically stable. Here we show that rhodium-substituted ε-Fe2O3, ε-RhxFe2−xO3 nanomagnets prepared by a nanoscale chemical synthesis using mesoporous silica as a template, exhibit a huge coercive field (Hc) of 27 kOe at room temperature. Furthermore, a crystallographically oriented sample recorded an Hc value of 31 kOe, which is the largest value among metal-oxide-based magnets and is comparable to those of rare-earth magnets. In addition, ε-RhxFe2−xO3 shows high frequency millimetre wave absorption up to 209 GHz. ε-Rh0.14Fe1.86O3 exhibits a rotation of the polarization plane of the propagated millimetre wave at 220 GHz, which is one of the promising carrier frequencies (the window of air) for millimetre wave wireless communications.

Suggested Citation

  • Asuka Namai & Marie Yoshikiyo & Kana Yamada & Shunsuke Sakurai & Takashi Goto & Takayuki Yoshida & Tatsuro Miyazaki & Makoto Nakajima & Tohru Suemoto & Hiroko Tokoro & Shin-ichi Ohkoshi, 2012. "Hard magnetic ferrite with a gigantic coercivity and high frequency millimetre wave rotation," Nature Communications, Nature, vol. 3(1), pages 1-6, January.
    • Handle: RePEc:nat:natcom:v:3:y:2012:i:1:d:10.1038_ncomms2038
    DOI: 10.1038/ncomms2038
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