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Thickness-dependent double-epitaxial growth in strained SrTi0.7Co0.3O3-delta films

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Tang, Astera S.
Sun, Xueyin
Ross, Caroline A.

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Date

2018

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Journal Article

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Abstract

Perovskite-structured SrTi0.7Co0.3O3-delta (STCo) films of varying thicknesses were grown on SrTiO3(001) substrates using pulsed laser deposition. Thin films grow with a cube-on-cube epitaxy, but for films exceeding a critical thickness of about 120 nm, a double-epitaxial microstructure was observed, in which (110)-oriented crystals nucleated within the (001)-oriented STCo matrix, both orientations being epitaxial with the substrate. The crystal structure, strain state, and magnetic properties are described as a function of film thickness. Both the magnetic moment and the coercivity show maxima at the critical thickness. The formation of a double-epitaxial microstructure provides a mechanism for strain relief in epitaxially mismatched films.

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American Chemical Society (ACS)

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Nanoscience, Nanotechnology, Materials science

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Acs Applied Materials & Interfaces

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DOI

10.1021/acsami.7b18808

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https://doi.org/10.1021/acsami.7b18808
 https://hdl.handle.net/20.500.14288/16301

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