Heterogeneous Two-Phase Pillars in Epitaxial NiFe 2 O 4 -LaFeO 3 Nanocomposites

Comes, Ryan B.; Perea, Daniel E.; Spurgeon, Steven R.

doi:10.1002/admi.201700396

Heterogeneous Two-Phase Pillars in Epitaxial NiFe ₂ O ₄ -LaFeO ₃ Nanocomposites

Journal Article · Mon Jul 10 04:00:00 EDT 2017 · Advanced Materials Interfaces

DOI:https://doi.org/10.1002/admi.201700396· OSTI ID:1378006

^[1]; Perea, Daniel E. ^[2]; ^[3]

Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland WA 99352 USA; Department of Physics, Auburn University, Auburn AL 36849 USA
Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland WA 99352 USA
Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland WA 99352 USA

Self-assembled epitaxial oxide nanocomposites have been explored for a wide range of applications, including multiferroic and magnetoelectric properties, plasmonics, and catalysis. These so-called “vertically aligned nanocomposites” form spontaneously during the deposition process when segregation into two phases is energetically favorable as compared to a solid solution. However, there has been surprisingly little work understanding the driving forces that govern the synthesis of these materials, which can include point defect energetics, surface diffusion, and interfacial energies. To explore these factors, La-Ni-Fe-O films have been synthesized by molecular beam epitaxy and it is shown that these phase segregate into spinel-perovskite nanocomposites. Using complementary scanning transmission electron microscopy and atom-probe tomography, the elemental composition of each phase is examined and found that Ni ions are exclusively found in the spinel phase. From correlative analysis, a model for the relative favorability of the Ni2+ and Ni3+ valences under the growth conditions is developed. It is shown that multidimensional characterization techniques provide previously unobserved insight into the growth process and complex driving forces for phase segregation.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1378006

Report Number(s):: PNNL-SA-124622

Journal Information:: Advanced Materials Interfaces, Journal Name: Advanced Materials Interfaces Journal Issue: 16 Vol. 4; ISSN 2196-7350

Publisher:: Wiley-VCH

Country of Publication:: United States

Language:: English

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