Tuning functional properties by plastic deformation

Details Tuning functional properties by plastic deformation Tuning functional properties by plastic deformation

Aug 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009njph...11h3013k&link_type=abstract

New Journal of Physics, Volume 11, Issue 8, pp. 083013 (2009).

Physics

5

Scientific paper

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.

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