Head-to-head domain-wall phase diagram in mesoscopic ring magnets

[Zhi-Pan Li]

M. Kläui, et. al. Applied Physics Letters, Vol. 85, No. 23, pp.
5637-5639, 6 December 2004

discussed the phase boundary between vortex domain wall and transverse
domain wall. it is previously found and hereby confirmed that the
boundary follows roughly d*w=constant, where d is the film thickness
and w ring width. differnt regions on the phase diagram is
differentiated, esp. the local minimum. Not quite sure what the
difference between region 2 and 3 is.