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Dr. Peter Schiffer, Yale University

Artificial spin ice consists of arrays of lithographically fabricated single-domain ferromagnetic elements, arranged in different geometries such that the magnetostatic interactions between the moments are frustrated. Because we can both design the lattice geometries and probe the individual moments, these systems allow us to study the accommodation of frustration with exquisite detail and flexibility.

I will report results from two recent areas of experimental research in artificial spin ice. The first area of research consists of studies of artificial spin ice arrays with lattice geometries that are unavailable in natural systems and are specifically designed to manifest novel forms of frustration. These so-called “vertex frustrated” lattices demonstrate that novel forms of frustration result in unusual collective behavior. The second area of research has been detailed electrical transport studies of connected artificial spin ice systems. We find that appropriate micromagnetic modeling allows us to explain the fascinating collective magnetoresistance phenomena in these systems and reveals the crucial role of the vertex regions in how electronic transport is manifested.

References: Gilbert et al., Physics Today 69, 54 (2016), and Nature Physics 12,162 (2016). Le et al., New Journal of Physics 17, 23047 (2015) and Physical Review B 95, 060405(R) (2017); Nisoli et al. Nature Physics 13, 200 (2017); Lao et al., Nature Physics 14, 723 (2018); Sklenar et al., Nature Physics 15, 191 (2019)