挠曲磁电相互作用的自由能
On the Free Energy of the Flexomagnetoelectric Interactions
摘要：
结果表明，对于立方（六八面体）晶体，局部挠曲磁电效应的自由能量密度由四个唯象常数决定。只有当固定的电极化的强度引起磁化强度的不均匀性时，著名的单常数Lifshitz不变项才是正确的。提出的唯象理论应用于磁畴壁。对畴壁结构进行了详细研究。四常数唯象理论符合基于对称性的预言（V.G. Bar'yakhtar等人，1984年）。提出的四常数挠曲磁电现象的实验验证是在强均匀电场下检测Néel畴壁的移动。
英文摘要：
It was shown that free energy density of the local flexomagnetoelectric effect is determined by the four phenomenological constants in case of the cubic (hexoctahedral) crystal. The well-known single-constant Lifshitz invariant term is correct only when fixed electric polarization induces the inhomogeneity of the magnetization. Proposed phenomenological theory was applied to the magnetic domain walls. The domain wall structure has been investigated in details. The four-constant phenomenological theory conforms to the symmetry based predictions (V.G. Bar'yakhtar et al., 1984). The proposed experimental verification of the four-constant flexomagnetoelectric phenomenology is a detection of the shift of the Néel domain walls under the strong homogeneous electric field.
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