在CaRuO3界面阶段通过磁性近距离效应实现了具有强大的自旋轨道合的室温铁磁
Jie Zheng1,2, Jing Zhang3, Sheng Cheng4
1Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
ACS nano
|November 11, 2024
概括
研究人员在CaRuO3/La0.67Sr0.33MnO3超中创建了一个新的铁磁界面相. 这个阶段表现出显著增强的异常霍尔效应,为先进的氧化物自旋电子学铺平了道路.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 这就是Spintronics.
背景情况:
- 具有强大的旋转轨道合 (SOC) 的铁磁铁对于高效的旋转轨道扭矩 (SOT) 装置至关重要.
- 在合适的材料中与强大的SOC一起实现室温铁磁性仍然是一个挑战.
- 与预测的铁磁铁相比,传统的非磁性重金属在SOT效率方面存在局限性.
研究的目的:
- 为了研究CaRuO3/La0.67Sr0.33MnO3异构结构作为旋转源的潜力.
- 探索室温铁磁的诱导在重过渡金属氧化物中具有强大的SOC.
- 为了评估界面相的异常霍尔效应 (AHE) 特性.
主要方法:
- 制造的CaRuO3 / La0.67Sr0.33MnO3超级格子的制造.
- 使用电子能量损失光谱学 (EELS) 和极化中子反射计 (PNR) 进行了表征.
- 在不同温度下测量异常霍尔效应 (AHE) 导电性和霍尔角.
主要成果:
- 成功诱导了一个铁磁界面相,其基里温度高于300K.
- 证据表明,在接口处从Ru转移到Mn的强电荷,导致反铁磁交换相互作用.
- 对AHE的显著增强:与La0.67Sr0.33MnO3.3相比,异常的霍尔导电率在150K时增加了30倍,霍尔角增加了31倍.
结论:
- 该研究展示了一种用于诱导重过渡金属氧化物中铁磁性的新方法,具有强大的SOC.
- 在接口阶段,增强的AHE为旋tronic应用提供了显著的优势.
- 这些发现为开发全氧化物基础的自旋电子设备提供了有希望的前景.
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