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Cyclic Memories in Disordered Matter

Date:  Thursday, January 24th, 2019

Time: 4:00pm

Location: 100 Willamette Hall

Speaker: Nathan Keim,  Polytechnic State University

Abstract:

Cyclic driving happens all around us. Buildings and bridges are repeatedly loaded and unloaded, and temperatures change between day and night. This kind of driving can change a material, but in some cases it also forms memories that can be recalled later. I present two examples of materials that, when deformed repeatedly, can “learn” and report the magnitudes of those deformations: a suspension of particles in liquid, and a jammed solid made of closely packed particles. Their memories follow different rules, with jammed solids approximating the return-point behavior best known in magnetic materials. These materials’ disordered structure, and sometimes even the presence of noise, are essential for the fidelity of their memories.

Host: Eric Corwin

All attendees are invited to attend a colloquium reception in the Willamette Hall, Paul Olum atrium at 3:40pm.

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