Physics – Condensed Matter – Materials Science
Scientific paper
2007-10-10
Europhys. Lett., vol. 80, p. 57003 (2007)
Physics
Condensed Matter
Materials Science
4 pages, 5 figures, accepted for publication in Europhysics Letters (EPL)
Scientific paper
10.1209/0295-5075/80/57003
The cross-tie domain wall structure in micrometre and sub-micrometre wide patterned elements of NiFe, and a thickness range of 30 to 70nm, has been studied by Lorentz microscopy. Whilst the basic geometry of the cross-tie repeat units remains unchanged, their density increases when the cross-tie length is constrained to be smaller than the value associated with a continuous film. This occurs when element widths are sufficiently narrow or when the wall is forced to move close to an edge under the action of an applied field. To a very good approximation the cross-tie density scales with the inverse of the distance between the main wall and the element edge. The experiments show that in confined structures, the wall constantly modifies its form and that the need to generate, and subsequently annihilate, extra vortex/anti-vortex pairs constitutes an additional source of hysteresis.
Capella-Kort A.
Chapman James N.
McVitie S.
Otto Florian
Wiese N.
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