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Title: Tuning functional properties by plastic deformation
Authors: Kwon, A. R.Neu, V.Matias, V.Hänisch, J.Hühne, R.Freudenberger, J.Holzapfel, B.Schultz, L.Fähler, S.
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Issue Date: 2009
Published in: New Journal of Physics, Volume 11
Publisher: Milton Park : Taylor & Francis
Abstract: It is well known that a variation of lattice constants can strongly influence the functional properties of materials. Lattice constants can be influenced by external forces; however, most experiments are limited to hydrostatic pressure or biaxial stress. Here, we present an experimental approach that imposes a large uniaxial strain on epitaxially grown films in order to tune their functional properties. A substrate made of a ductile metal alloy covered with a biaxially oriented MgO layer is used as a template for growth of epitaxial films. By applying an external plastic strain, we break the symmetry within the substrate plane compared to the as-deposited state. The consequences of 2% plastic strain are examined for an epitaxial hard magnetic Nd2Fe14B film and are found to result in an elliptical distortion of the in-plane anisotropy below the spin-reorientation temperature. Our approach is a versatile method to study the influence of large plastic strain on various materials, as the MgO(001) layer used is a common substrate for epitaxial growth.
Keywords: As-deposited state; Biaxial stress; Ductile metals; Epitaxially grown; Experimental approaches; External force; Functional properties; In-plane anisotropy; Plastic strain; Spin-reorientation; Substrate planes; Uni-axial strains Versatile methods
DDC: 530
License: CC BY-NC-SA 3.0 Unported
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