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

Asuka Namai, Marie Yoshikiyo, Kana Yamada, Shunsuke Sakurai, Takashi Goto, Takayuki Yoshida, Tatsuro Miyazaki, Makoto Nakajima, Tohru Suemoto, Hiroko Tokoro and Shin-ichi Ohkoshi ()
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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

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: 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.

Date: 2012
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DOI: 10.1038/ncomms2038

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