Concentric magnetic nanorings

This is an interesting systems, to my knowledge the only like this, where the magnetization of concentric nanorings can be aligned parallel or anti-parallel. This could be used as a memory state for spin injection devices.

Pause the video at the middle, the magnetization is parallel

 

Now antiparallel
Refs:Journal of Applied Physics 117, 103901 (2015); doi: http://dx.doi.org/10.1063/1.4914346