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MA: Fachverband Magnetismus

MA 15: Computational Magnetism II

MA 15.6: Vortrag

Montag, 16. März 2020, 16:15–16:30, HSZ 403

Engineering relaxation pathways for plasmon-assisted nanomagnetic computation — •Naëmi Leo, Matteo Menniti, and Paolo Vavassori — CIC nanoGUNE, Donostia -- San Sebastián, Spain

Nanomagnetic logic, which uses arrays of magnetostatically-coupled single-domain nanomagnets for computation, is a low-power alternative to current charge-based semiconductor devices. At the heart of the computation process lies the thermal relaxation from a magnetic-field-set moment configuration towards a low-energy state of the interacting ensemble. The computational functionality of such circuits is determined by the single-spin-flip connectivity of magnetic states, and the temperature-dependent rates for moment orientations, that regulate which relaxation pathways the system will explore.

Here we discuss recent developments to manipulate the relaxation kinetics of nanomagnetic circuits: As the spatial arrangement of the nanomagnets determines the configuration energies, pathways of different character -- monotonic and intermittent -- can be realised, which lend themselves to the implementation of deterministic and probabilistic computation, respectively. To allow for the kinetic control of relaxation pathways, plasmon-assisted photoheating of hybrid gold-magnet nanostructures allows for fast, spatially-, and sublattice-selective heating schemes within time scales as short as a few tens of picoseconds.