Carrier-driven coupling in ferromagnetic oxide heterostructures

Ching Hao Chang, Angus Huang, Sujit Das, Horng Tay Jeng, Sanjeev Kumar, R. Ganesh

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

Transition metal oxides are well known for their complex magnetic and electrical properties. When brought together in heterostructure geometries, they show particular promise for spintronics and colossal magnetoresistance applications. In this article, we propose a carrier-driven coupling mechanism in heterostructures composed of itinerant ferromagnetic materials. The coupling is mediated by charge carriers that strive to maximally delocalize through the heterostructure to gain kinetic energy. In doing so, they force a ferromagnetic or antiferromagnetic coupling between the constituent layers. To illustrate this, we focus on heterostructures composed of SrRuO3 and La1-xAxMnO3 (A = Ca/Sr). Using the minority-carrier nature of SrRuO3, we provide a simple explanation for antiferromagnetic alignment that is known to occur in multilayers. We present a phenomenological Kondo-lattice model which reproduces the known magnetization properties of multilayers. In addition, we discuss a quantum well model for heterostructures and argue that the spin-dependent density of states determines the nature of the coupling. As a smoking gun signature, we propose that bilayers with the same constituents will oscillate between ferromagnetic and antiferromagnetic coupling upon tuning the relative thicknesses of the layers. We present ab initio results that support this prediction.

原文English
文章編號184408
期刊Physical Review B
96
發行號18
DOIs
出版狀態Published - 2017 十一月 7

All Science Journal Classification (ASJC) codes

  • 電子、光磁材料
  • 凝聚態物理學

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