外延锰薄膜中的非常规结构磁现象
Emergent Magnetic Phenomenon with Unconventional Structure in Epitaxial Manganate Thin Films
摘要：
复杂氧化物异质结构中的界面工程使各种新出现的现象成为可能。LaMnO_3（LMO）薄膜由于其与基体界面功能的控制而受到广泛关注，但其薄膜中磁相的性质却存在争议。本文报道了在（001）-SrTiO_3衬底外延生长的2和5个晶胞厚的LMO薄膜中，在8和10个晶胞厚的LMO薄膜中观察到铁磁/铁磁耦合，在15和20个晶胞厚的LMO薄膜中观察到明显的铁磁/反铁磁钉扎效应和明显的正交换偏置。高分辨扫描透射电子显微镜（SEM）研究表明，在15和20晶胞的LMO薄膜中，三种磁性有序共存，从界面到表面的P21/n对称性转变为Pbnm对称性，MnO 6八面体形貌的空间分层对应于不同的磁性有序。这些结果将为通过界面工程控制氧化物的功能提供一些新的思路。
英文摘要：
A variety of emergent phenomena has been enabled by interface engineering in the complex oxides heterostructures. While extensive attention has been attracted to LaMnO3 (LMO) thin films for observing the control of functionalities at its interface with substrate, the nature of the magnetic phases in the thin film is, however,controversial. Here, it is reported that the ferromagnetism in 2 and 5 unit cells thick LMO films epitaxially deposited (001)-SrTiO3 substrates ferromagnetic/ferromagnetic coupling in 8 and 10-unit-cell ones, and a striking ferromagnetic/antiferromagnetic pinning effect with apparent positive exchange bias in 15 and 20-unit-cell ones are observed. This novel phenomenon in both 15 and 20-unit-cell films indicates a coexistence of three magnetic orderings in a single LMO film.The high-resolution scanning transmission electron microscopy suggests a P21/n to Pbnm symmetry transition from interface to surface, with the spatial stratification of MnO6 octahedral morphology, corresponding to different magnetic orderings. These results should shed some new lights on manipulating the functionality of oxides by interface engineering.
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