|
由于磁电耦合系数α与介电常数ε和磁导率μ
满足热力学平均场理论关系:αij2<εiiμjj ,因此
铁磁-铁电多重铁性体具有可预期的最大磁电
耦合效应。而目前已知的(亚)铁磁-铁电体只有
三类,他们至少有一个相变温度低于200K,
实在不容乐观。下一个是谁呢?
The Holy Grail of multiferroics --- a strong
(uncanted) ferromagnet that is also ferroelectric at
room temperature --- has yet to be found.
J. F. Scott, Science 315, 954 (2007)
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