Highly Efficient Spin-Current Operation in a Cu Nano-Ring

Abstract

An all-metal lateral spin-valve structure has been fabricated with a medial Copper nano-ring to split the diffusive spin-current path. We have demonstrated significant modulation of the non-local signal by the application of a magnetic field gradient across the nano-ring, which is up to 30% more efficient than the conventional Hanle configuration at room temperature. This was achieved by passing a dc current through a current-carrying bar to provide a locally induced Ampère field. We have shown that in this manner a lateral spin-valve gains an additional functionality in the form of three-terminal gate operation for future spintronic logic.

Development of an optically gated Fe/n-GaAs spin-polarized transistor

“…However, the small differential signals compared with the measurement errors rule out a conclusive observation of the effect at this stage. As can be seen from the large modulation efficiency of the Ampère-fieldgenerating current-gating of a nanometric nano-ring [28], the miniaturisation of our devices is expected to increase our modulation efficiency. The optical gating technique in our structure could have a significant advantage over conventional electric-field gating due to a lower power consumption up to 25% [29].…”

Thermal stability of the spin injection in Co/Ag/Co lateral spin valves

“…This stimulated the researchers' interest on spin injection in lateral spin valves. [8][9][10] So far, spin polarized current has been injected into various kinds of materials, such as copper, [11] silver, [12][13][14] gold, [15,16] magnesium, [17] and two dimensional materials. [18][19][20] It is found that the magnitude of the spin accumulation signal is quite small when the ferromagnetic material is directly attached to the non-ferromagnetic materials.…”