Magnetic domain pattern in hierarchically twinned epitaxial Ni-Mn-Ga films

Magnetic shape memory alloys exhibit a hierarchically twinned microstructure, which has been examined thoroughly in epitaxial Ni-Mn-Ga films. Here we analyze the consequences of this 'twin within twins' microstructure on the magnetic domain pattern. Atomic and magnetic force microscopy are...

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Bibliographic Details
Published in:Journal of physics. Condensed matter 2013-07, Vol.25 (26), p.266002-266002
Main Authors: Diestel, Anett, Neu, Volker, Backen, Anja, Schultz, Ludwig, Fähler, Sebastian
Format: Article
Language:English
Subjects:
Alloys - chemistry
Boundaries
Condensed matter
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Correlation
Cross-disciplinary physics: materials science
rheology
Domain effects, magnetization curves, and hysteresis
Domain walls and domain structure
Epitaxy
Exact sciences and technology
Gallium - chemistry
Magnetic domains
Magnetic fields
Magnetic properties and materials
Magnetics
Manganese - chemistry
Martensitic transformations
Materials science
Materials Testing
Microscopy, Atomic Force
Microstructure
Nickel
Nickel - chemistry
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Physics
Temperature
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Summary:Magnetic shape memory alloys exhibit a hierarchically twinned microstructure, which has been examined thoroughly in epitaxial Ni-Mn-Ga films. Here we analyze the consequences of this 'twin within twins' microstructure on the magnetic domain pattern. Atomic and magnetic force microscopy are used to probe the correlation between the martensitic microstructure and magnetic domains. We examine the consequences of different twin boundary orientations with respect to the substrate normal as well as variant boundaries between differently aligned twinned laminates. A detailed micromagnetic analysis is given which describes the influence of the finite film thickness on the formation of magnetic band domains in these multiferroic materials.
ISSN:0953-8984
1361-648X
DOI:10.1088/0953-8984/25/26/266002