Multiferroic M-type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity.
Multiferroic M-type hexaferrites with a room-temperature conical state and magnetically controllable spin helicity.
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DOI：
10.1103/physrevlett.105.257201
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发表时间：
2010-12
影响因子：
8.6
通讯作者：
Yusuke Tokunaga;Yoshio Kaneko;Daisuke Okuyama;S. Ishiwata;Taka-hisa Arima;S. Wakimoto;K. Kakurai
中科院分区：
文献类型：
--
作者：
Yusuke Tokunaga;Yoshio Kaneko;Daisuke Okuyama;S. Ishiwata;Taka-hisa Arima;S. Wakimoto;K. Kakurai
研究了掺Sc的M型六角晶系钡铁氧体单晶的磁性和磁电性能。磁化强度(M)和中子衍射测量表明，通过调节Sc的浓度，可以将纵向圆锥态稳定到室温以上。ME测量表明，横向磁场(H)可以在较低的温度下诱导电极化(P)，并且自旋螺旋度是不挥发的，并且在圆锥形磁相变温度附近是持久的。研究还发现，P向量对M反转的响应(反转或保留)随温度而变化。反过来，这一特征允许我们控制自旋螺旋度和M矢量与H和温度的关系。
Magnetic and magnetoelectric (ME) properties have been studied for single crystals of Sc-doped M-type barium hexaferrites. Magnetization (M) 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 (H) can induce electric polarization (P) at lower temperatures and that the spin helicity is nonvolatile and endurable up to near the conical magnetic transition temperature. It was also revealed that the response (reversal or retention) of the P vector upon the reversal of M varies with temperature. In turn, this feature allows us to control the relation between the spin helicity and the M vectors with H and temperature.