On the left is a magnetic force microscope (MFM) image of a CoFeB
patterned film, and on the right is a representation of the
micromagnetics (distribution of local magnetic moments). The pattern
shows a crosstie wall at the middle comprised of two magnetic
antivortices are at the centers of the diamonds and three vortices at
the junctions connecting the triangular and diamond areas. Patterns such
as these can produce microwaves by dc current excitations using the
spin-torque effect.
