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Event Date and Time
John Cumings, University of Maryland
A scholarly adage of Materials Science tells us that, "Materials are like people; it's the defects that make them interesting!" However, when it comes to truly understanding basic physical properties, defects in crystals routinely present tough problems. Artificial Spin Ice (ASI) is a class of lithographically fabricated synthetic materials where the exact structure can be controlled precisely on nm length scales that determine their magnetic behavior. This provides a unique and fertile platform to study the behavior of magnetic order parameters and other degrees of freedom within solids. The approach has been put to good use to study frustration, entropy, thermalization and ergodicity in materials with degenerate (or nearly-degenerate) ground state manifolds. I will present work were we investigate the impact of both unintentional disorder in otherwise perfect ASIs and also intentional disorder, where were design nearly-perfect lattices containing topological defects. I will attempt to extrapolate the results into broader classes of materials, where new Physics may come from future studies focused specifically on defects and disorder.