Magnetocapacitance in geometrically frustrated magnet ZnFe 2O4

Takehito Suzuki, Yuki Aikawa, Takuro Katsufuji

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    We report the measurement of dielectric constant in ZnFe2O 4 as a function of temperature and magnetic field. The behavior of dielectric constant for single crystals, which is dominated by the pair correlation of the neighboring Fe spins, indicates that ferromagnetic correlation is enhanced below 30 K, but is suppressed below 10 K, where positive magnetocapacitance is enhanced. It is also found that the magnetocapacitance of polycrystalline samples is much larger (∼ 10% at 14 T) than that of single crystals, because of the additional dielectric relaxation coupled with a uniform magnetization.

    Original languageEnglish
    Pages (from-to)863-866
    Number of pages4
    JournalJournal of the Physical Society of Japan
    Volume74
    Issue number3
    DOIs
    Publication statusPublished - 2005 Mar

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    magnets
    permittivity
    single crystals
    temperature distribution
    magnetization
    magnetic fields

    Keywords

    • Magnetocapacitance
    • Spin frustration
    • Spinel

    ASJC Scopus subject areas

    • Physics and Astronomy(all)

    Cite this

    Magnetocapacitance in geometrically frustrated magnet ZnFe 2O4 . / Suzuki, Takehito; Aikawa, Yuki; Katsufuji, Takuro.

    In: Journal of the Physical Society of Japan, Vol. 74, No. 3, 03.2005, p. 863-866.

    Research output: Contribution to journalArticle

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    AB - We report the measurement of dielectric constant in ZnFe2O 4 as a function of temperature and magnetic field. The behavior of dielectric constant for single crystals, which is dominated by the pair correlation of the neighboring Fe spins, indicates that ferromagnetic correlation is enhanced below 30 K, but is suppressed below 10 K, where positive magnetocapacitance is enhanced. It is also found that the magnetocapacitance of polycrystalline samples is much larger (∼ 10% at 14 T) than that of single crystals, because of the additional dielectric relaxation coupled with a uniform magnetization.

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