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Event Date and Time
Joseph Sklenar
One path towards realizing an artificial spin system involves nanostructuring thin magnetic films into single magnetic domain elements or islands. In the simplest form, these islands behave as giant Ising (binary) spin states which can be mapped onto spin-lattice models. The earliest example of such a nanomagnet system was the so-called artificial spin ice system, where an artificial spin system was designed to promote geometric frustration and simulate real spin ice materials. However, as interest in artificial spin ice grew, other areas of inquiry developed. Three areas of interest to me are: 1) What are the best strategies to thermally equilibrate artificial spin systems into true ground states? 2) Can we experimentally manipulate the microstate of an artificial spin system into any arbitrary state? 3) Can artificial spin systems beyond the Ising models (Potts, Heisenberg) be fabricated? Upon summarizing progress in these research directions, I will discuss my recent experimental results motivated by these interests. I will describe a new artificial spin system where the quadrupole configurations of the system can order into different configurations when thermally active in the absence or presence of an external field. These experiments allow us for the first time to map the phase diagram and study field-induced phase transitions in artificial spin ice-type systems. I will conclude my talk discussing future directions where the disorder dimension of the phase diagram can be probed in a controllable manner so that a random bond Ising model, a precursor to an artificial spin glass, is realized.