Browsing by Author "Sasagawa, T."

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  • Magnetodielectric response of square-coordinated MnO2 unit in cubic BiMn7O12
    (2011) Imamura, N.; Singh, K.; Pelloquin, D.; Simon, Ch.; Sasagawa, T.; Karppinen, M.; Yamauchi, H.; Maignan, A.
     A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    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.
  • Magnetodielectric response of square-coordinated MnO[sub 2] unit in cubic BiMn[sub 7]O[sub 12]
    (2011) Imamura, N.; Singh, K.; Pelloquin, D.; Simon, Ch.; Sasagawa, T.; Karppinen, Maarit; Yamauchi, H.; Maignan, A.
     School of Chemical Technology | A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
    The magnetodielectric (MD) effect for BiMn7O12 with the cubic A′A′′3B4O12-type A-site-ordered perovskitestructure 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.