a magnetic nano - ring device and method of fabrication includes providing a substrate ; forming at least one nano - pillar on the substrate ; depositing a plurality of electrodes on the substrate ; depositing an anti - ferromagnetic layer on a first electrode of the plurality of electrodes ; depositing a first ferromagnetic layer on the anti - ferromagnetic layer ; depositing a tunnel barrier layer on the first ferromagnetic layer ; depositing a second ferromagnetic layer on the tunnel barrier layer ; planarizing the nano - pillars and the second ferromagnetic layer to form a co - planar nano - pillar and second ferromagnetic layer ; depositing a second electrode on the co - planar nano - pillar and second ferromagnetic layer ; and forming a nano - structure ring in a substantially cylindrical configuration .