Multiferroic -type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity

マルチフェロイックM型ヘキサフェライトの室温スピン円錐構造とスピン螺旋の磁場制御

徳永 祐介*; 金子 良夫*; 奥山 大輔*; 石渡 晋太郎*; 有馬 孝尚*; 脇本 秀一  ; 加倉井 和久; 田口 康二郎*; 十倉 好紀*

Tokunaga, Yusuke*; Kaneko, Yoshio*; Okuyama, Daisuke*; Ishiwata, Shintaro*; Arima, Takahisa*; Wakimoto, Shuichi; Kakurai, Kazuhisa; Taguchi, Yasujiro*; Tokura, Yoshinori*

Magnetic and magnetoelectric (ME) properties have been studied for single crystals of Sc-doped -type barium hexaferrites. Magnetization () and neutron diffraction measurements revealed that by tuning Sc concentration a longitudinal conical state is stabilized up to above room temperatures. ME measurements have shown that a transverse magnetic field () can induce electric polarization () at lower temperatures and that the spin helicity is nonvolatile and endurable up to near the conical magnetic transition temperature.