Magnetoelectric coupling in MbTiO3

N. Mufti, G.R. Blake, M. Mostovoy, S. Riyadi, A.A. Nugroho, Thom T.M. Palstra

    Research output: Contribution to journalArticleAcademicpeer-review

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    Abstract

    We give general arguments that show that the linear magnetoelectric effect in antiferromagnetic materials gives rise to a magnetocapacitance anomaly—a divergence of the dielectric constant at the magnetic ordering temperature TN that appears in an applied magnetic field. The measurement of magnetodielectric response thus provides a definitive and experimentally accessiblemethod to recognize antiferromagnetic linear magnetoelectric materials, circumventing the experimental difficulties often involved in measuring electric polarization. We confirm this result experimentally using the example of MnTiO3, which we show to exhibit the linear magnetoelectric effect. No dielectric anomaly is observed at TN in the absence of an applied magnetic field. However, a sharp peak in the dielectric constant appears here when a magnetic field is applied along the c axis,
    reflecting a linear coupling of the polarization P with the antiferromagnetic order parameter L. In accordance with our theoretical analysis, the dielectric constant close to TN increases with the square of the magnetic field.
    Original languageEnglish
    Pages (from-to)104416-1-1-4416-6
    Number of pages6
    JournalPhysical review B: Condensed matter and materials physics
    Volume83
    Issue number10
    DOIs
    Publication statusPublished - 22 Mar 2011

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