Emergent Magnetic Phenomenon with Unconventional Structure in Epitaxial Manganate Thin Films,Advanced Science

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Emergent Magnetic Phenomenon with Unconventional Structure in Epitaxial Manganate Thin Films
Advanced Science ( IF 14.3 ) Pub Date : 2021-05-06 , DOI: 10.1002/advs.202100177
Mingwei Yang _{1,

2} , Kuijuan Jin _{1,

2,

3} , Hongbao Yao _{1,

2} , Qinghua Zhang ₁ , Yiru Ji _{1,

2} , Lin Gu _{1,

2} , Wenning Ren _{1,

2} , Jiali Zhao ₄ , Jiaou Wang ₄ , Er-Jia Guo _{1,

2,

3} , Chen Ge _{1,

2} , Can Wang _{1,

2,

3} , Xiulai Xu _{1,

2,

3} , Qiong Wu ₅ , Guozhen Yang _{1,

2}

Affiliation

A variety of emergent phenomena are enabled by interface engineering in the complex oxides heterostructures. While extensive attention is 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 two and five unit cells thick LMO films epitaxially deposited on (001)-SrTiO₃ substrates, a ferromagnetic/ferromagnetic coupling in eight and ten unit cells ones, and a striking ferromagnetic/antiferromagnetic pinning effect with apparent positive exchange bias in 15 and 20 unit cells ones are observed. This novel phenomenon in both 15 and 20 unit cells 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 can shed some new lights on manipulating the functionality of oxides by interface engineering.

中文翻译：

外延锰酸盐薄膜中具有非常规结构的新兴磁性现象

复杂氧化物异质结构中的界面工程可以实现各种新出现的现象。_{虽然LaMnO 3} (LMO) 薄膜因观察其与基底界面的功能控制而受到广泛关注，但薄膜中磁性相的性质仍存在争议。据报道，外延沉积在 (001)-SrTiO ₃衬底上的两个和五个晶胞厚 LMO 薄膜中的铁磁性，八个和十个晶胞中的铁磁/铁磁耦合，以及显着的铁磁/反铁磁钉扎效应在 15 和 20 单元电池中观察到明显的正交换偏差。15 和 20 晶胞薄膜中的这一新现象表明在单个 LMO 薄膜中三种磁序共存。高分辨率扫描透射电子显微镜表明从界面到表面的P2 ₁ /n到Pbnm对称转变，以及MnO ₆八面体形态的空间分层，对应于不同的磁序。这些结果可以为通过界面工程操纵氧化物的功能提供一些新的线索。

更新日期：2021-07-07

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