Large Coercive Field of 45 kOe in a Magnetic Film Based on Metal-Substituted ϵ-Iron Oxide

Shin Ichi Ohkoshi, Kenta Imoto, Asuka Namai, Shizuka Anan, Marie Yoshikiyo, Hiroko Tokoro

Research output: Contribution to journalArticlepeer-review

49 Citations (Scopus)


Magnetic ferrites are stable, sustainable, and economical. Consequently, they have been used in various fields. The development of large coercive field (large Hc) magnetic ferrites is a very important but challenging issue to accelerate the spread of use and to expand practical applications. In this study, we prepared a rhodium-substituted ϵ-iron oxide film and observed a remarkably large Hc value of 35 kOe at room temperature. This is the largest value among magnetic ferrites to date. Such a large-Hc ferrite is expected to greatly expand the application of magnetic ferrites. Furthermore, when the temperature dependence of the magnetic properties was measured, an even larger Hc value of 45 kOe was recorded at 200 K. Such large Hc values are much larger than those of conventional hard magnetic ferrites.

Original languageEnglish
Pages (from-to)13268-13271
Number of pages4
JournalJournal of the American Chemical Society
Issue number38
Publication statusPublished - Sept 27 2017
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Catalysis
  • General Chemistry
  • Biochemistry
  • Colloid and Surface Chemistry


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