Tunable magnetic anisotropy of CoFe2O4 nanopillar arrays released from BiFeO3 matrix |
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| Authors: | Zhiguang Wang Ravindranath Viswan Bolin Hu V G Harris Jie‐Fang Li D Viehland |
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| Institution: | 1. Department of Materials Science and Engineering, Virginia Tech, 306 Holden Hall, Blacksburg, Virginia 24061, USA;2. Department of Electrical and Computer Engineering, Northeastern University, Boston, Massachusetts 02115, USA |
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| Abstract: | We deposited epitaxial BiFeO3–CoFe2O4 (BFO–CFO) self‐assembled thin films on (001) SrTiO3 (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) |
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| Keywords: | self‐assembly thin films magnetic anisotropy CoFe2O4 nanopillars magnetic force microscopy |
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