界面氧空位工程对（La,Sr）MnO3异质结构的磁调制

IF 3.6 2区物理与天体物理 Q2 PHYSICS, APPLIED

Applied Physics Letters Pub Date : 2025-07-15 DOI:10.1063/5.0257910

Chengye Yin, Zeyu Zha, Chengcheng Xu, Junjie Wang, Mingyang Fan, Song Dai, Zhipeng Xu, Liqiang Xu, Kun Han, Zhen Huang, Pingfan Chen

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引用次数: 0

摘要

界面氧空位的控制为相关氧化物异质结构提供了额外的功能可调性。本文研究了LaAlO3和LaMnO3等非晶封盖层对（La,Sr）MnO3//SrTiO3异质结构磁性能的控制作用。当（La,Sr）MnO3层较薄（~ 4 nm）时，非晶LaAlO3封盖层显著抑制了铁磁相互作用，无论外延取向如何，与未封盖层相比，居里温度TC （ΔTC超过−300 K）和饱和矩MS （ΔMS在−2.9 μB/Mn）都降低了。这种铁磁性抑制归因于界面氧空位的产生，如在非原位退火（625℃空气中1小时）后铁磁性恢复所证明的那样。此外，当用LaMnO3取代LaAlO3时，封盖层中氧亲和性的降低导致磁调制不明显，在−100 K下ΔTC和−1.1 μB/Mn下ΔMS。此外，（La,Sr）MnO3层厚度的增加稀释了封盖层效应，导致laalo3封盖的40 nm厚（La,Sr）MnO3//SrTiO3样品的TC和MS变化可以忽略不计。我们的研究结果不仅有助于理解锰基异质结构中的盖层效应，而且为其他氧化物界面的功能调节提供了可行的策略。

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Magnetic modulations in (La,Sr)MnO3 heterostructures via interfacial oxygen vacancy engineering

The control of interfacial oxygen vacancy provides additional functional tunability to correlated oxide heterostructures. Here, we studied the role of amorphous capping layers, such as LaAlO3 and LaMnO3, in controlling magnetic properties of (La,Sr)MnO3//SrTiO3 heterostructures. When (La,Sr)MnO3 layers are thin (∼4 nm), the amorphous LaAlO3 capping layer significantly suppresses the ferromagnetic interaction, denoted by a decreased Curie temperature TC (ΔTC over −300 K) and saturated moment MS (ΔMS at −2.9 μB/Mn) compared to the uncapped counterparts, irrespective of epitaxial orientations. This ferromagnetic suppression is attributed to the creation of interfacial oxygen vacancies, as evidenced by the recovery of ferromagnetism upon ex situ annealing (1 h at 625 °C in air). Moreover, when replacing LaAlO3 with LaMnO3, the reduction of oxygen affinity in the capping layer results in less pronounced magnetic modulations with ΔTC at −100 K and ΔMS at −1.1 μB/Mn. Also, the increase in (La,Sr)MnO3 layer thickness dilutes the capping-layer effect, leading to negligible changes on TC and MS in the LaAlO3-capped 40-nm-thick (La,Sr)MnO3//SrTiO3 samples. Our results not only shed some light on understanding the capping-layer effect in manganite-based heterostructures but also offer a feasible strategy for functional modulations at other oxide interfaces.

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来源期刊

Applied Physics Letters 物理-物理：应用

CiteScore

6.40

自引率

10.00%

发文量

1821

审稿时长

1.6 months

期刊介绍： Applied Physics Letters (APL) features concise, up-to-date reports on significant new findings in applied physics. Emphasizing rapid dissemination of key data and new physical insights, APL offers prompt publication of new experimental and theoretical papers reporting applications of physics phenomena to all branches of science, engineering, and modern technology. In addition to regular articles, the journal also publishes invited Fast Track, Perspectives, and in-depth Editorials which report on cutting-edge areas in applied physics. APL Perspectives are forward-looking invited letters which highlight recent developments or discoveries. Emphasis is placed on very recent developments, potentially disruptive technologies, open questions and possible solutions. They also include a mini-roadmap detailing where the community should direct efforts in order for the phenomena to be viable for application and the challenges associated with meeting that performance threshold. Perspectives are characterized by personal viewpoints and opinions of recognized experts in the field. Fast Track articles are invited original research articles that report results that are particularly novel and important or provide a significant advancement in an emerging field. Because of the urgency and scientific importance of the work, the peer review process is accelerated. If, during the review process, it becomes apparent that the paper does not meet the Fast Track criterion, it is returned to a normal track.