Effect of lithographically-induced strain relaxation on the magnetic domain configuration in microfabricated epitaxially grown Fe 81 Ga 19 .

Autor: Beardsley RP; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Parkes DE; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Zemen J; Department of Physics, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2AZ, UK., Bowe S; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.; Diamond Light Source Chilton, Didcot, Oxfordshire OX11 0DE UK., Edmonds KW; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Reardon C; Department of Physics, University of York, Heslington, York, YO10 5DD, UK., Maccherozzi F; Diamond Light Source Chilton, Didcot, Oxfordshire OX11 0DE UK., Isakov I; Department of Physics, Blackett Laboratory, Imperial College, Prince Consort Road, London SW7 2AZ, UK.; London Centre of Nanotechnology, University College London, London, WC1H 0AH, UK., Warburton PA; London Centre of Nanotechnology, University College London, London, WC1H 0AH, UK., Campion RP; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Gallagher BL; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK., Cavill SA; Diamond Light Source Chilton, Didcot, Oxfordshire OX11 0DE UK.; Department of Physics, University of York, Heslington, York, YO10 5DD, UK., Rushforth AW; School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, UK.
Jazyk: angličtina
Zdroj: Scientific reports [Sci Rep] 2017 Feb 10; Vol. 7, pp. 42107. Date of Electronic Publication: 2017 Feb 10.
DOI: 10.1038/srep42107
Abstrakt: We investigate the role of lithographically-induced strain relaxation in a micron-scaled device fabricated from epitaxial thin films of the magnetostrictive alloy Fe 81 Ga 19 . The strain relaxation due to lithographic patterning induces a magnetic anisotropy that competes with the magnetocrystalline and shape induced anisotropies to play a crucial role in stabilising a flux-closing domain pattern. We use magnetic imaging, micromagnetic calculations and linear elastic modelling to investigate a region close to the edges of an etched structure. This highly-strained edge region has a significant influence on the magnetic domain configuration due to an induced magnetic anisotropy resulting from the inverse magnetostriction effect. We investigate the competition between the strain-induced and shape-induced anisotropy energies, and the resultant stable domain configurations, as the width of the bar is reduced to the nanoscale range. Understanding this behaviour will be important when designing hybrid magneto-electric spintronic devices based on highly magnetostrictive materials.
Competing Interests: The authors declare no competing financial interests.
Databáze: MEDLINE
Externí odkaz: