Abstract
We report on the direct observation of notch-free domain wall (DW) trapping and field history effect on the DW behavior in Ni80Fe20 asymmetric ring. We found that a 360° DW is trapped at the narrow arm while the ring adopts a vortex configuration. The stability of DW is dependent on the chirality of the vortex state and the external field direction. A 360° DW trapped in a clockwise vortex configuration is highly resistant to annihilation upon the application of +x field; the 360° DW trapped in an anticlockwise vortex breaks apart with a small +x field.
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