3$d$-5$d$基La$_{0.67}$Ca$_{0.33}$MnO$_3$/SrIrO$_3$双层膜中的不对称磁电阻：单向各向异性的作用
Asymmetric magnetoresistance in 3$d$-5$d$ based La$_{0.67}$Ca$_{0.33}$MnO$_3$/SrIrO$_3$ bilayer: The role of unidirectional anisotropy
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中文总结 AI 辅助
本研究通过实验揭示3d铁磁/5d重金属双层膜中界面磁耦合诱导的不对称磁电阻，归因于单向各向异性与自旋散射调控，为功能异质结构设计提供新见解。
中文摘要 AI 辅助
由铁磁体（FM）和重金属（HM）组成的异质结构界面处，自旋-轨道耦合、磁性和磁场的复杂相互作用常展现出非凡的磁电现象，其中面内Dzyaloshinskii-Moriya（DM）相互作用在稳定FM层中的局域自旋纹理方面起着关键作用。本文报道了外延生长的3$d$ FM La$_{0.67}$Ca$_{0.33}$MnO$_3$（LCMO）与5$d$ HM SrIrO$_3$（SIO）构成的薄异质结构的详细磁性和磁输运行为。磁性测量显示，SrIrO$_3$在约42 K处出现异常的磁有序发展，进而导致界面处Mn/Ir磁耦合。磁电阻（MR）测量显示，其数值和形状随该双层膜的磁态演化。高温下MR为负值，随着LCMO磁有序的稳定，MR呈现从正到负的交叉，最终在低温下随着SIO的有序化，正MR表现出不对称性。我们将这种异常的MR行为归因于界面驱动的巡游电子与局域电子之间变化的自旋散射，我们的结果为理解特定设计的异质结构中复杂但可调的界面行为对电荷输运的影响提供了启示，为未来功能材料工程提供了有价值的见解。
英文摘要
The complex interplay between spin-orbit coupling, magnetism, and magnetic field at the interface of a heterostructure consisting of ferromagnet (FM) and heavy metal (HM), often exhibit extraordinary magnetic and electric phenomena where an in-plane Dzyaloshinskii-Moriya (DM) interaction plays a crucial role to stabilize local spin texture in FM layer. Here, we report detailed magnetic and magneto-transport behaviour on an epitaxially grown thin heterostructure with 3$d$ FM La$_{0.67}$Ca$_{0.33}$MnO$_3$ (LCMO) and 5$d$ HM SrIrO$_3$ (SIO). Magnetic measurements show an unusual development of magnetic ordering in SrIrO3 around 42 K, which further leads to a Mn/Ir magnetic coupling at the interface. The magnetoresistance (MR) measurements show an evolution of its value and shape with the magnetic state of this bilayer. While MR is negative at high temperature, it shows a positive to negative crossover with stable magnetic ordering of LCMO, and finally the positive MR exhibits an asymmetry at low temperature with the ordering of SIO. While we ascribe this unusual MR behaviour to interface-driven varying spin scattering between itinerant and localized electrons, our results shed a light to comprehend the complex but tunable interface behavior on charge transport in a particularly designed heterostructure, offering valuable insights for future functional material engineering.
发表机构
- Jawaharlal Nehru University（贾瓦哈拉尔·尼赫鲁大学）
- Indian Institute of Technology, Hauz Khaz（印度理工学院豪兹卡兹校区）
- Special Centre for Nanoscience, Jawaharlal Nehru University（贾瓦哈拉尔·尼赫鲁大学纳米科学特别中心）
- UGC-DAE Consortium for Scientific Research, Indore（印度古物与考古学联合会-原子能部科学研究中心）
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