MnTe和MnTe/ZnTe外延膜的磁致伸缩驱动的多铁性
Magnetostriction-driven multiferroicity of MnTe and MnTe/ZnTe epitaxial films
摘要：
在这里，我们表明，MnTe外延薄膜与锌的混合物结构和MnTe/ZnTe多层膜应显示铁电极化在反铁磁（AFM）有序状态，因此属于多铁性。自发铁电极化是由磁致伸缩剪切应变引起的高离子Mn-Te-Mn键弯曲引起的。铁电极化的取向与AFM矢量的取向耦合，因此可以通过施加外部磁场来控制。由于电、磁序参量的钳制，MnTe中的畴结构由两种机制控制：电偶极子产生的退极化场和磁弹性偶极子产生的去应力场。单畴化电场和磁场的大小取决于样品的形状，并随膜厚的增加而减小。磁畴的磁电性质使得可以通过线性和非线性光学方法（克尔效应、二次谐波产生技术）来可视化磁畴结构。
英文摘要：
Here we demonstrate that MnTe epitaxial films with zinc-blend structure and MnTe/ZnTe multilayers should show ferroelectric polarization in antiferromagnetically (AFM) ordered state and thus belong to multiferroics. Spontaneous ferroelectric polarization results from the bending of highly ionic Mn-Te-Mn bonds induced by magnetostrictive shear strain. Orientation of ferroelectric polarization is coupled with orientation of AFM vector and thus can be controlled by application of the external magnetic field. Due to the clamping of electric and magnetic order parameters, domain structure in MnTe is governed by two mechanisms: depolarizing field produced by electric dipoles and destressing field produced by magnetoelastic dipoles. The values of monodomainization electric and magnetic fields depend upon the sample shape and diminish with the film thickness. Magnetoelectric nature of the domains make it possible to visualize the domain structure by linear and nonlinear optical methods (Kerr effect, second harmonic generation technique).
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