Tuning interfacial ferromagnetism in LaNiO3/CaMnO3 superlattices by stabilizing nonequilibrium crystal symmetry

C. L. Flint, A. Vailionis, H. Zhou, H. Jang, J.-S. Lee, and Y. Suzuki
Phys. Rev. B 96, 144438 – Published 31 October 2017
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Abstract

Perovskite oxide heterostructures offer an important path forward for stabilizing and controlling low-dimensional magnetism. One of the guiding design principles for these materials systems is octahedral connectivity. In superlattices composed of perovskites with different crystal symmetries, variation of the relative ratio of the constituent layers and the individual layer thicknesses gives rise to nonequilibrium crystal symmetries that, in turn, lead to unprecedented control of interfacial ferromagnetism. We have found that in superlattices of CaMnO3 (CMO) and LaNiO3 (LNO), interfacial ferromagnetism can be modulated by a factor of 3 depending on LNO and CMO layer thicknesses as well as their relative ratio. Such an effect is only possible due to the nonequilibrium crystal symmetries at the interfaces and can be understood in terms of the anisotropy of the exchange interactions and modifications in the interfacial Ni-O-Mn and Mn-O-Mn bond angles and lengths with increasing LNO layer thickness. These results demonstrate the potential of engineering nonequilibrium crystal symmetries in designing ferromagnetism.

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  • Received 12 May 2017

DOI:https://doi.org/10.1103/PhysRevB.96.144438

©2017 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

C. L. Flint1,2, A. Vailionis2, H. Zhou3, H. Jang4, J.-S. Lee4, and Y. Suzuki2,5

  • 1Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA
  • 2Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA
  • 3Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA
  • 5Department of Applied Physics, Stanford University, Stanford, California 94305, USA

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Issue

Vol. 96, Iss. 14 — 1 October 2017

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