Enhanced Ferromagnetism in Atomically Thin Oxides Achieved by Interfacial Reconstruction
Enhanced Ferromagnetism in Atomically Thin Oxides Achieved by Interfacial Reconstruction
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DOI：
10.1002/adfm.202313294
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发表时间：
2024-02-08
影响因子：
19
通讯作者：
Suzuki，Yuri
中科院分区：
文献类型：
--
作者：
Yi，Di;Tang，Aihua;Suzuki，Yuri
超薄铁磁材料的发现对基础科学和技术应用都具有重要意义。过渡金属氧化物(TMO)在下一代自旋电子学中是很有前途的候选材料，尽管随着厚度减小到纳米级，铁磁性会严重衰减。本文提出了一种消除原子薄氧化物中磁死层的有效策略，即利用3D和5DOX单层膜的外延界面来协调强交换作用和大的单轴磁各向异性。结合多种实验方法，明确地证明了只有一个La0.2Sr0.8MnO_3单层夹杂在SrIrO_3单层(总厚度为三个晶胞)的超薄氧化物异质结构中存在铁磁相变。值得注意的是，与以前报道的铁磁性单层氧化物相比，单层锰氧化物的饱和磁化强度(2µBMN−1)和居里温度(80 K)都有很大的提高。结果证明了在超薄TMOS中产生强铁磁性的一般策略，潜在地使新型氧化物自旋轨道电子器件成为可能。
Discoveries of ferromagnetic materials with ultrathin thickness are of great importance for both fundamental science and technological applications. Transition metal oxides (TMOs) provide promising candidates in the context of next‐generation spintronics, despite the severe decay of ferromagnetism as the thickness reduces to the nanometer regime. Here, an efficient strategy to eliminate the magnetic dead layer in atomically thin oxides is presented, by using the epitaxial interface of 3dand 5doxide monolayers that reconciles both strong exchange interaction and large uniaxial magnetic anisotropy. Combining multiple experimental methods, a ferromagnetic transition in an ultrathin oxide heterostructure comprised of only one La0.2Sr0.8MnO3monolayer sandwiched by SrIrO3monolayer (total thickness of three unit‐cells) is unambiguously demonstrated. Remarkably, a largely enhanced saturation magnetization (2 µBMn−1) and Curie temperature (80 K) are observed for the single manganite monolayer, as compared to previously reported ferromagnetic monolayer oxides. The results demonstrate a general strategy for creating robust ferromagnetism in ultrathin TMOs, potentially enabling novel oxide spin‐orbitronic devices.