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Magnetic ordering anisotropy in epitaxial orthorhombic multiferroic YMnO3 films

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9 Author(s)
Hsieh, C.C. ; Department of Electrophysics, National Chiao Tung University, Hsinchu 30010, Taiwan ; Lin, T.H. ; Shih, H.C. ; Hsu, C.-H.
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Orthorhombic YMnO3 thin films with (200), (020), and (001) orientations were, respectively, obtained by pulsed laser deposition on SrTiO3(110), LaAlO3(110), and SrTiO3(001) substrates. The results demonstrate that the strain between film and substrate can serve as an alternative in transforming the thermodynamically stable hexagonal YMnO3 into the orthorhombic phase, which previously could be obtained with high-pressure high temperature syntheses and epitaxy-stabilized thin film processes. More importantly, these films allow us, for the first time, to unambiguously disclose the intrinsic magnetic property along different crystallographic orientations. Our results show that, although the antiferromagnetic (AFM) ordering remains the same, there is an additional spin reordering transition which is very much dependent on the crystallographic orientation along which the measuring field was applied and on the in-plane crystallographic alignment of the films. Detailed analyses indicate that the origin of the observed second reordering may be due to some strain-induced canted AFM state instead of the incommensurate lock-in transitions conceived previously.

Published in:

Journal of Applied Physics  (Volume:104 ,  Issue: 10 )

Date of Publication:

Nov 2008

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