Polarity and Spin-Orbit Coupling Induced Strong Interfacial Exchange Coupling: An Asymmetric Charge Transfer in Iridate-Manganite Heterostructure
Polarity and Spin-Orbit Coupling Induced Strong Interfacial Exchange Coupling: An Asymmetric Charge Transfer in Iridate-Manganite Heterostructure
复制标题
极性和自旋轨道耦合引发强界面交换耦合：铱酸盐·锰酸盐异质结构中的不对称电荷转移
DOI：
10.1021/acsami.9b14641
复制
发表时间：
2019
影响因子：
9.5
通讯作者：
He Hongtao
中科院分区：
文献类型：
--
作者：
Yu Tao;Deng Bei;Zhou Liang;Chen Pingbo;Liu Qiying;Wang Cailin;Ning Xingkun;Zhou Jingtian;Bian Zhiping;Luo Zhenlin;Qiu Chunyin;Shi Xing-Qiang;He Hongtao
电荷转移在操纵过渡金属氧化物异质结构中的界面物理中特别重要。在这项工作中，我们已经制作了由极性的3D LaMnO 3和非极性的5D SrIrO 3的外延双层。系统的磁性测量揭示了一个意想不到的大交换偏置效应的双层，连同一个戏剧性的增强LaMnO 3的介电常数。基于第一性原理计算和X射线吸收光谱测量，发现这种强的界面磁耦合与LaMnO 3的极性和SrIrO 3中强的自旋-轨道相互作用密切相关，它们共同驱动了不对称的界面电荷转移并导致界面重入自旋/超自旋玻璃态的出现.我们的研究为过渡金属氧化物异质结构中的电荷转移提供了新的见解，并提供了一种新的手段来调整各种器件应用的界面交换耦合。
Charge transfer is of particular importance in manipulating the interface physics in transition-metal oxide heterostructures. In this work, we have fabricated epitaxial bilayers composed of polar 3d LaMnO3and nonpolar 5d SrIrO3. Systematic magnetic measurements reveal an unexpectedly large exchange bias effect in the bilayer, together with a dramatic enhancement of the coercivity of LaMnO3. Based on first-principle calculations and X-ray absorption spectroscopy measurements, such a strong interfacial magnetic coupling is found closely associated with the polar nature of LaMnO3and the strong spin–orbit interaction in SrIrO3, which collectively drive an asymmetric interfacial charge transfer and lead to the emergence of an interfacial reentrant spin/superspin glass state. Our study provides a new insight into the charge transfer in transition-metal oxide heterostructures and offers a novel means to tune the interfacial exchange coupling for a variety of device applications.