Abstract A surface magneto-electric effect in hybrid multilayer systems consisting of antiferromagnet (Cr2O3) and ferromagnet films is considered using the Landau theory. We show that the antiferromagnetic order parameter in Cr2O3 film can be switched without applying an external magnetic field. Only an electric field is needed. The switching happens in the surface region of Cr2O3. The thickness of the switched region is of order of the domain wall width. If the antiferromagnetic layer thinner than the domain wall the electric field switches the whole layer. In the ferromagnet/Cr2O3/ferromagnet structure with the thin antiferromagnetic layer, the magneto-electric effect can be turned on and off by reversal of magnetization of one of the ferromagnetic leads. The ME effect is “turned on” when the ferromagnetic layers magnetizations are co-directed and “turned off” in the opposite case.

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关于铁磁体/Cr2O3/铁磁体多层膜中磁电耦合的理论

摘要 使用朗道理论考虑了由反铁磁体 (Cr2O3) 和铁磁体薄膜组成的混合多层系统中的表面磁电效应。我们表明，可以在不施加外部磁场的情况下切换 Cr2O3 薄膜中的反铁磁有序参数。只需要一个电场。转换发生在 Cr2O3 的表面区域。开关区的厚度是畴壁宽度的数量级。如果反铁磁层比畴壁薄，则电场会切换整个层。在具有薄反铁磁层的铁磁体/Cr2O3/铁磁体结构中，可以通过铁磁引线之一的磁化反转来开启和关闭磁电效应。