Magnetic nanostructures by adaptive twinning in strained epitaxial films

Details Magnetic nanostructures by adaptive twinning in strained epitaxial films Magnetic nanostructures by adaptive twinning in strained epitaxial films

2011-07-19

arxiv.org/abs/1107.3763v3

Phys. Rev. Lett. 107, 206105 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Final version. Supplementary information available on request or at the publisher's website

Scientific paper

10.1103/PhysRevLett.107.206105

We exploit the intrinsic structural instability of the Fe70Pd30 magnetic shape memory alloy to obtain functional epitaxial films exhibiting a self-organized nanostructure. We demonstrate that coherent epitaxial straining by 54% is possible. The combination of thin film experiments and large-scale first-principles calculations enables us to establish a lattice relaxation mechanism, which is not expected for stable materials. We identify a low twin boundary energy compared to a high elastic energy as key prerequisite for the adaptive nanotwinning. Our approach is versatile as it allows to control both, nanostructure and intrinsic properties for ferromagnetic, ferroelastic and ferroelectric materials.

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