EPSRC CDT in Metamaterials (PhD studentship): Excitation of spin waves in magnetic elements using surface acoustic waves

University of Exeter - Departments of Physics and Engineering

The propagation of precessional excitations of ordered spins in magnetic materials – so-called spin waves – in magnonic crystals and devices is in the heart of magnonics and envisaged magnonic technology for data and signal processing. However, spin waves often suffer from significant loss, one of the greatest obstacles for commercialisation of magnonic devices. This is in contrast to surface acoustic wave technology, which has already found its way to analogue processing of microwave signals. Within the project, we will lay down the ground work for a totally novel type of magnon-acoustic metamaterials that will combine the best of two worlds within the same package: the low loss of surface acoustic waves and the reconfigurability and magnetic field tuneability inherent to magnetic constituents. Specifically, we will explore excitation of spin wave modes confined in magnetic microelements by propagating surface acoustic waves. Once the excitation of the spin waves is confirmed using our state of the art Time Resolved Scanning Kerr Microscopy (TRSKM) measurements, we will proceeed to development of protocols for application of the external magnetic field for controlling and ultimately reprogramming of functional metamaterials formed by loading acoustic waveguides with arrays of magnetic elements. The experimental results will be informed and then interpreted using numerical micromagnetic simulations and analytical theory.

The student will learn from his/her peers within CDT that are already engaged in magnonics and acoustics research, and also from those practicing micromagnetic modelling using the two CDT's workstations for GPU-enabled micromagnetic simulations.

This studentship is part of the Centre of Doctoral Training in Metamaterials. Please see all fully funded opportunities.

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Type / Role:

PhD

Location(s):

South West England