Magnetic flux penetration in superconductors

Type II superconducting thin films can allow penetration of magnetic fields in the form of magnetic vortices, without loosing the overall superconducting state, rendering them this way technologically useful. Here a calculation:

Ref similar works: https://doi.org/10.1103/PhysRevB.93.054521

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