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Tunable magnetic anisotropy of CoFe 2 O 4 nanopillar arrays released from BiFeO 3 matrix
Author(s) -
Wang Zhiguang,
Viswan Ravindranath,
Hu Bolin,
Harris V. G.,
Li JieFang,
Viehland D.
Publication year - 2012
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105498
Subject(s) - nanopillar , materials science , coercivity , annealing (glass) , condensed matter physics , epitaxy , hysteresis , magnetic hysteresis , magnetic anisotropy , anisotropy , nanotechnology , magnetic field , nuclear magnetic resonance , composite material , magnetization , nanostructure , optics , physics , layer (electronics) , quantum mechanics
We deposited epitaxial BiFeO 3 –CoFe 2 O 4 (BFO–CFO) self‐assembled thin films on (001) SrTiO 3 (STO) substrates. We find that a combined annealing and etching process could remove the BFO matrix, thereby resulting in free‐standing CFO nanopillar arrays. Scanning electron and atomic force microscopies showed well separated CFO nanopillars, which were very similar to the original CFO ones in the self‐assembled structure. Finally, comparison of the magnetic hysteresis loops before and after removal of the BFO matrix showed a significant decrease of the coercive field and a dramatic decrease in the strain dominated magnetic anisotropy. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)