Magnetic Phase Formation in Self-Assembled Epitaxial BiFeO[subscript 3]–MgO and BiFeO[subscript 3]–MgAl[subscript 2]O[subscript 4] Nanocomposite Films Grown by Combinatorial Pulsed Laser Deposition
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Ross_Magnetic phase.pdf
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Author(s)
Kim, Dong Hun
Kim, Tae Cheol
Eun, Yun Jae
Lee, Taeho
Jeong, Sung Gyun
Ross, Caroline A.
Sun, Xueyin
Date Issued
January 2016
Journal
ACS Applied Materials & Interfaces
Publisher
American Chemical Society (ACS)
Citation
Kim, Dong Hun, XueYin Sun, Tae Cheol Kim, Yun Jae Eun, Taeho Lee, Sung Gyun Jeong, and Caroline A. Ross. “Magnetic Phase Formation in Self-Assembled Epitaxial BiFeO[subscript 3]–MgO and BiFeO[subscript 3]–MgAl[subscript 2]O[subscript 4] Nanocomposite Films Grown by Combinatorial Pulsed Laser Deposition.” ACS Applied Materials & Interfaces 8, no. 4 (February 3, 2016): 2673–2679. © 2016 American Chemical Society
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Final published version
Abstract
Self-assembled epitaxial BiFeO[subscript 3]–MgO and BiFeO[subscript 3]–MgAl[subscript 2]O[subscript 4] nanocomposite thin films were grown on SrTiO[subscript 3] substrates by pulsed laser deposition. A two-phase columnar structure was observed for BiFeO[subscript 3]–MgO codeposition within a small window of growth parameters, in which the pillars consisted of a magnetic spinel phase (Mg,Fe)[subscript 3]O[subscript 4] within a BiFeO[subscript 3] matrix, similar to the growth of BiFeO[subscript 3]–MgFe[subscript 2]O[subscript 4] nanocomposites reported elsewhere. Further, growth of a nanocomposite with BiFeO[subscript 3]–(CoFe[subscript 2]O[subscript 4]/MgO/MgFe[subscript 2]O[subscript 4]), in which the minority phase was grown from three different targets, gave spinel pillars with a uniform (Mg,Fe,Co)[subscript 3]O[subscript 4] composition due to interdiffusion during growth, with a bifurcated shape from the merger of neighboring pillars. BiFeO[subscript 3]–MgAl[subscript 2]O[subscript 4] did not form a well-defined vertical nanocomposite in spite of having lower lattice mismatch, but instead formed a two-phase film with in which the spinel phase contained Fe. These results illustrate the redistribution of Fe between the oxide phases during oxide codeposition to form a ferrimagnetic phase from antiferromagnetic or nonmagnetic targets.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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DOI of Published Version
https://doi.org/10.1021/acsami.5b10676
