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

被引：22

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.

引用

页数：7

共 38 条

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