Two distinct ferroelectric phases in the multiferroic Y-type hexaferrite Ba2Mg2Fe12O22
Two distinct ferroelectric phases in the multiferroic Y-type hexaferrite Ba2Mg2Fe12O22
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DOI：
10.1103/physrevb.80.180419
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发表时间：
2009-11-01
影响因子：
3.7
通讯作者：
Hirota, Kazuma
中科院分区：
文献类型：
--
作者：
Sagayama, Hajime;Taniguchi, Kouji;Hirota, Kazuma
用单晶中子衍射研究了Y型六角铁氧体Ba_2Mg_2Fe_（12）O_（22）的磁相图。结果表明，连续相变的磁调制波数不连续地改变时，施加磁场和温度的变化。对于低温自旋驱动铁电态，我们发现在弱磁场中存在q=（0 0 1/2）的六重结构，在强磁场中存在q=（0 0 3/2）的二重结构，其间存在一级相变并伴有磁滞现象.
The magnetic phase diagram of the Y-type hexaferrite Ba2Mg2Fe12O22 has been studied using single-crystal neutron diffraction. The result indicates successive phase transitions where the magnetic modulation wave number changed discontinuously when a magnetic field is applied and the temperature is varied. For the low-temperature spin-driven ferroelectric state, we have found a sixfold structure with q=(0 0 1/2) in weak magnetic fields and a twofold structure with q=(0 0 3/2) in strong magnetic fields between which a first-order transition intervenes accompanied by a hysteresis.