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Enhanced Bending Tuned Magnetic Properties in Epitaxial Cobalt Ferrite Nanopillar Arrays on Flexible Substrate

Abstract

Large-scale epitaxial (111) CoFe2O4 nanopillar arrays with an average nanopillar diameter of ~40-60 nm and the thicknesses of 26-700 nm have been obtained on flexible fluorophlogopite substrates by chemical etching the vertically aligned self-assembly CoFe2O4:MgO nanocomposite thin films. The chemical etching process has not affected the crystalline quality of the CoFe2O4 phase, but resulted in a volume shrinkage through removing the surrounding MgO phase. Compared with the planar CoFe2O4 films, the nanopillar arrays show sharply declined coercivity and enhanced saturation magnetization. Even the thinnest nanoisland shape arrays (~26 nm) retain relatively high saturation magnetization (~90 emu/cc), nonzero coercivity (~250 Oe) and remanence (~30 emu/cc), which are promising for the requirements of weak ferromagnetism in flexible devices. Under increasing bending radius, a strong and monotonous increase of the saturation/remanent magnetization has been found in the nanopillar arrays. It reveals that the bending induced shape anisotropy as well as the intrinsic magnetocrystalline anisotropy mainly dominates the tunable magnetic properties in the CoFe2O4 nanopillar arrays. With strong bending, the increment of remanent magnetization in the nanopillar arrays can be as high as 98%, exhibiting huge potential in future applications of bending sensors and related devices .

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Publication details

The article was received on 08 Nov 2017, accepted on 03 Jan 2018 and first published on 03 Jan 2018


Article type: Communication
DOI: 10.1039/C7MH00939A
Citation: Mater. Horiz., 2018, Accepted Manuscript
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    Enhanced Bending Tuned Magnetic Properties in Epitaxial Cobalt Ferrite Nanopillar Arrays on Flexible Substrate

    L. Shen, M. Liu, C. Ma, L. Lu, H. Fu, C. You, X. Lu and C. Jia, Mater. Horiz., 2018, Accepted Manuscript , DOI: 10.1039/C7MH00939A

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