Magnetodielectric response of square-coordinated MnO2 unit in cubic BiMn7O12

N. Imamura, K. Singh, D. Pelloquin, Ch. Simon, T. Sasagawa, M. Karppinen, H. Yamauchi, A. Maignan

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    The magnetodielectric (MD) effect for BiMn7O12 with the cubic A′A″3B4O12-type A-site-ordered perovskite structure has been investigated. A clear negative MD response around and beyond TN has been observed and attributed to antiferromagnetic spin fluctuations. With further decreasing temperature (T⪡TN) a switching to a complex positive MD effect is found confirming additional contribution coming from the magnetic ordering. The present study underlines the importance of square-coordinated MnA″O2 units for generating MD coupling in an A′A″3B4O12-type structure; the magnitude of the MD effect then strongly depends on the precise chemical composition.
    Original languageEnglish
    Article number072903
    Pages (from-to)1-3
    JournalApplied Physics Letters
    Issue number7
    Publication statusPublished - 2011
    MoE publication typeA1 Journal article-refereed


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