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Neutron diffraction studies on the multiferroic conical magnet Ba$$_{2}$$Mg$$_{2}$$Fe$$_{12}$$O$$_{22}$$

マルチフェロイック・コニカル磁性体Ba$$_{2}$$Mg$$_{2}$$Fe$$_{12}$$O$$_{22}$$の中性子回折研究

石渡 晋太郎*; 奥山 大輔*; 加倉井 和久; 西 正和*; 田口 康二郎*; 十倉 好紀*

Ishiwata, Shintaro*; Okuyama, Daisuke*; Kakurai, Kazuhisa; Nishi, Masakazu*; Taguchi, Yasujiro*; Tokura, Yoshinori*

Magnetic structure of a multiferroic Y-type hexaferrite Ba$$_{2}$$Mg$$_{2}$$Fe$$_{12}$$O$$_{22}$$ with helical-spin structures propagating along [001] below 195K has been extensively studied, using polarized and unpolarized neutron diffractions under transverse magnetic fields up to 4.5T. The magnetic phase diagram was investigated as a function of transverse B and coexistence of several phases with different helical-spin periodicity was confirmed at low-B region. By using the polarized neutron diffraction under transverse B, we verified that the ferroelectric phase with the largest electric polarization P with a commensurate k0 vector (0,0,3/2) has a transverse-conical structure. The relation between the transverse-conical spin structure and P as a function of the transverse B is discussed in terms of the inverse Dzyaloshinskii-Moriya model.

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パーセンタイル:8.92

分野:Materials Science, Multidisciplinary

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