Journal
NATURE COMMUNICATIONS
Volume 3, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms2038
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Funding
- Core Research for Evolutional Science and Technology (CREST) program of the Japan Science and Technology Agency (JST)
- Japan Society for the Promotion of Science (JSPS)
- DOWA Technofund
- Asahi Glass Foundation
- JSPS
- Grant for the Global COE Program 'Chemistry Innovation through Cooperation of Science and Engineering'
- Advanced Photon Science Alliance (APSA) from the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT)
- Cryogenic Research Center
- University of Tokyo
- Center for Nano Lithography Analysis
- MEXT
- Grants-in-Aid for Scientific Research [23244063, 23686012, 20675001] Funding Source: KAKEN
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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 epsilon-Fe2O3, epsilon-RhxFe2-xO3 nanomagnets prepared by a nanoscale chemical synthesis using mesoporous silica as a template, exhibit a huge coercive field (H-c) of 27 kOe at room temperature. Furthermore, a crystallographically oriented sample recorded an H-c value of 31 kOe, which is the largest value among metal-oxide-based magnets and is comparable to those of rareearth magnets. In addition, epsilon-RhxFe2-xO3 shows high frequency millimetre wave absorption up to 209 GHz. epsilon-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.
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