Physics Chat
Exploring the phase space of 3D Artificial Spin-ice
Speaker: Edward Harding (SLadak)
Date: Friday 19 November 2021
Time: 15:00
Venue: Zoom
The production and manipulation of magnetic charges within spin ice systems has been at the forefront of research, investigating the symmetry between electricity and magnetism. Our group has fabricated 3D artificial spin ice using two-photon lithography and thermal evaporation of magnetic materials with a purpose to investigate magnetic charge manipulation and propagation along the surface of these systems. Magnetic force microscopy has been used to study the charge dynamics along the surface layers of the system. Magnetic fields have been applied along the surface termination and it is seen that local energetics force magnetic charges to nucleate over a larger characteristic distance, reducing their magnetic coulomb interaction and producing uncorrelated monopoles. Applying a field perpendicular to the direction of the surface termination layer results in highly correlated monopole-antimonopole pairs. Micromagnetic and Monte Carlo simulations suggest it is the difference in effective chemical potential as well as the energy landscape experienced during dynamics that produces this difference in monopole transport. Further fabrication and research is aimed at understanding the ordering of this system at ground state as well as probing deeper into the system for bulk dynamics.
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