Role of polar compensation in interfacial ferromagnetism of LaNiO3/CaMnO3 superlattices

被引：19
|
作者：
Flint, C. L. [1 ,2 ]
Jang, H. [3 ]
Lee, J. -S. [3 ]
N'Diaye, A. T. [4 ]
Shafer, P. [4 ]
Arenholz, E. [4 ]
Suzuki, Y. [2 ,5 ]
机构：
[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
[2] Stanford Univ, Geballe Lab Adv Mat, Stanford, CA 94305 USA
[3] SLAC Natl Accelerator Lab, Stanford Synchrotron Radiat Lightsource, Menlo Pk, CA 94025 USA
[4] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA 94720 USA
[5] Stanford Univ, Dept Appl Phys, Stanford, CA 94305 USA
来源：
PHYSICAL REVIEW MATERIALS | 2017年 / 1卷 / 02期
关键词：
THIN-FILMS;
D O I：
10.1103/PhysRevMaterials.1.024404
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Polar compensation can play an important role in the determination of interfacial electronic and magnetic properties in oxide heterostructures. Using x-ray absorption spectroscopy, x-raymagnetic circular dichroism, bulk magnetometry, and transportmeasurements, we find that interfacial charge redistribution via polar compensation is essential for explaining the evolution of interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices as a function of LaNiO3 layer thickness. In insulating superlattices (four unit cells or less of LaNiO3), magnetism is dominated by Ni-Mn superexchange, while itinerant electron-based Mn-Mn double exchange plays a role in thicker metallic superlattices. X-ray magnetic circular dichroism and resonant x-ray scattering show that Ni-Mn superexchange contributes to the magnetization even in metallic superlattices. This Ni-Mn superexchange interaction can be explained in terms of polar compensation at the LaNiO3-CaMnO3 interface. These results highlight the different mechanisms responsible for interfacial ferromagnetism and the importance of understanding compensation due to polar mismatch at oxide-based interfaces when engineering magnetic properties.
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页数：7
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