TY  - JOUR
AU  - Shen, Lvkang
AU  - Liu, Ming
AU  - Ma, Chunrui
AU  - Lu, Lu
AU  - Fu, Huarui
AU  - You, Caiyin
AU  - Lu, Xiaoli
AU  - Jia, Chun-Lin
TI  - Enhanced bending-tuned magnetic properties in epitaxial cobalt ferrite nanopillar arrays on flexible substrates
JO  - Materials Horizons
VL  - 5
IS  - 2
SN  - 2051-6355
CY  - Cambridge
PB  - RSC Publ.
M1  - FZJ-2019-01064
SP  - 230 - 239
PY  - 2018
AB  - Herein, large-scale epitaxial (111) CoFe2O4 nanopillar arrays with an average nanopillar diameter of ∼40–60 nm and thicknesses of 26–700 nm have been obtained on flexible fluorophlogopite substrates by chemically etching the vertically aligned self-assembled CoFe2O4:MgO nanocomposite thin films. The chemical etching process has not affected the crystalline quality of the CoFe2O4 phase, but results in volume shrinkage through the removal of 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-shaped arrays (∼26 nm) retain a relatively high saturation magnetization (∼90 emu cc−1), nonzero coercivity (∼250 Oe), and remanence (∼30 emu cc−1), which are promising for the requirements of weak ferromagnetism in flexible devices. With an increase in the bending radius, a strong and monotonous increase in saturation/remanent magnetization has been found in the nanopillar arrays. This reveals that the bending-induced shape anisotropy as well as the intrinsic magnetocrystalline anisotropy mainly dominate 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 the huge potential of these nanopillar arrays in future applications such as in bending sensors and related devices.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000433442800006
DO  - DOI:10.1039/C7MH00939A
UR  - https://juser.fz-juelich.de/record/860289
ER  -