Vertically Aligned Single-Crystalline CoFe2O4 Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy

Fan, Lisha; Gao, Xiang; Farmer, Thomas O.; Lee, Dongkyu; Guo, Er-Jia; Mu, Sai; Wang, Kai; Fitzsimmons, Michael R.; Chisholm, Matthew F.; Ward, Thomas Zac; Eres, Gyula; Lee, Ho Nyung

doi:10.3390/nano10030472

Title: Vertically Aligned Single-Crystalline CoFe₂O₄ Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy

Journal Article · Thu Mar 05 00:00:00 EST 2020 · Nanomaterials

DOI:https://doi.org/10.3390/nano10030472· OSTI ID:1615211

Fan, Lisha ^[1]; Gao, Xiang ^[2]; Farmer, Thomas O. ^[2];

^[2];

^[2]; Wang, Kai ^[2];

^[2];

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Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Zhejiang Univ. of Technology, Hangzhou (China)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Micrometer-tall vertically aligned single-crystalline CoFe₂O₄ nanobrush architectures with extraordinarily large aspect ratio have been achieved by the precise control of a kinetic and thermodynamic non-equilibrium pulsed laser epitaxy process. Direct observations by scanning transmission electron microscopy reveal that the nanobrush crystal is mostly defect-free by nature, and epitaxially connected to the substrate through a continuous 2D interface layer. In contrast, periodic dislocations and lattice defects such as anti-phase boundaries and twin boundaries are frequently observed in the 2D interface layer, suggesting that interface misfit strain relaxation under a non-equilibrium growth condition plays a critical role in the self-assembly of such artificial architectures. Further, magnetic property measurements have found that the nanobrushes exhibit a saturation magnetization value of 6.16 μB/f.u., which is much higher than the bulk value. The discovery not only enables insights into an effective route for fabricating unconventional high-quality nanostructures, but also demonstrates a novel magnetic architecture with potential applications in nanomagnetic devices.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences (CNMS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1615211

Journal Information:: Nanomaterials, Vol. 10, Issue 3; ISSN 2079-4991

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 2 works

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36 MATERIALS SCIENCE
cobalt ferrite
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pulsed laser epitaxy
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single crystalline
magnetization
tailored anisotropy

Title: Vertically Aligned Single-Crystalline CoFe2O4 Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy

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Title: Vertically Aligned Single-Crystalline CoFe₂O₄ Nanobrush Architectures with High Magnetization and Tailored Magnetic Anisotropy