The top image shows a spin-polarized scanning tunneling microscopy (STM)
image of a chain of Co atoms on a Mn monolayer on the (110) surface of W.
The height profile (3D view) displays the topographic image while the
color scale represents the measured differential conductivity. The small
arrows shown in addition denote the spin direction of
the Co atoms in the chain. It rotates along the chain due to exchange
coupling with the underlying Mn monolayer which is in a spin spiral state
visible as the blue wave pattern
(spin structure of the Mn monolayer is shown in figure
on chiral magnetism).