Charge Transfer and Orbital Reconstruction in Strain-Engineered (La,Sr)MnO3/LaNiO3 Heterostructures

详细信息    查看全文

• 作者：Jingjing Peng ; Cheng Song ; Fan Li ; Bin Cui ; Haijun Mao ; Yuyan Wang ; Guangyue Wang ; Feng Pan
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：August 19, 2015
• 年：2015
• 卷：7
• 期：32
• 页码：17700-17706
• 全文大小：414K
• ISSN：1944-8252

文摘

We investigate charge transfer, orbital reconstruction, and the emergence of exchange bias in (La,Sr)MnO₃/LaNiO₃ heterostructures. We demonstrate that charge transfer from Mn³⁺ ions to Ni³⁺ ions is accompanied by the formation of hybridized Mn/Ni 3z² 鈥?r² orbits at the interface, instead of strain-stabilized Mn and Ni x² 鈥?y² orbits in the bulk films. In the heterostructures with ultrathin LaNiO₃, orbital reconstruction induced by charge transfer results in magnetization frustration of (La,Sr)MnO₃ at the interface. But the strain effect exerted by the growth of the LaNiO₃ top layer plays a dominant role on orbital reconstruction in the heterostructures with thick LaNiO₃, stabilizing 3z² 鈥?r² orbits. In this case, robust spin glass, associated with larger magnetization frustration, accounts for the exchange bias effect. Our work builds a bridge between the microscopic electronic structure and the macroscopic magnetic property, providing the possibility of manipulating the exotic states with the aid of strain engineering in oxide-based electronics.