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Abstract:
We determine experimentally the spin structure of half-metallic
Co2FeAl0.4Si0.6 Heusler alloy elements using magnetic microscopy.
Following magnetic saturation, the dominant magnetic states consist of
quasi-uniform configurations, where a strong influence from the
magnetocrystalline anisotropy is visible. Heating experiments show the
stability of the spin configuration of domain walls in confined
geometries up to 800 K. The switching temperature for the transition
from transverse to vortex walls in ring elements is found to increase
with ring width, an effect attributed to structural changes and
consequent changes in magnetic anisotropy, which start to occur in the
narrower elements at lower temperatures. (C) 2011 American Institute of
Physics. [doi: 10.1063/1.3657828]
