Strong pinning effect and magnetic nanodomain formation by coupling between magnetic and crystallographic domains in the ordered double perovskite Ba2FeMoO6
Strong pinning effect and magnetic nanodomain formation by coupling between magnetic and crystallographic domains in the ordered double perovskite Ba2FeMoO6
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DOI：
10.1103/physrevb.75.184440
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发表时间：
2007-05-01
影响因子：
3.7
通讯作者：
Matsui, Y.
中科院分区：
文献类型：
--
作者：
Asaka, T.;Yu, X. Z.;Matsui, Y.
利用透射电子显微镜研究了有序双钙钛矿Ba2FeMoO6单晶中磁性畴与晶体学畴之间的关系。通过对磁畴和反相畴结构的直接观察，我们证明了磁畴壁与晶体反相畴边界完全重合。此外，通过施加磁场，我们观察到了磁畴结构的变化。大部分磁畴发生了沿外加磁场方向的旋转，而磁化方向与外加磁场方向相反的局部区域则保持在反相边界附近。这表明在反相边界的磁畴上有很强的钉住效应。此外，我们成功地观察到磁性和结构有序畴之间耦合产生的磁性纳米畴结构，其中Fe/Mo形成了短程有序结构。我们发现有序双钙钛矿的磁畴结构受晶体结构（即反相边界和短程有序）的显著影响，因为它们具有强的相互耦合性。
We investigated relations between magnetic and crystallographic domains in a single crystal of an ordered double perovskite, Ba2FeMoO6, by means of transmission electron microscopy. By direct observation of the magnetic domain and antiphase domain structures, we demonstrated that magnetic domain walls perfectly coincide with crystallographic antiphase domain boundaries. In addition, we observed a change of magnetic domain structures by applying magnetic fields. Most of the magnetic domains undergo the rotation so as to be along the applying fields, while the local regions with magnetization direction opposite to the applying field remain adjacent to the antiphase boundary. This suggests a strong pinning effect on the magnetic domains at the antiphase boundaries. Moreover, we successfully observed a magnetic nanodomain structure derived from coupling between magnetic and structural ordering domains where Fe/Mo short-range ordering was developed. We found that the magnetic domain structure in the ordered double perovskite is significantly affected by the crystallographic structures, i.e., the antiphase boundary and the short-range ordering, due to their strong mutual coupling.