Field-Induced Magnetic Monopole Plasma in Artificial Spin Ice
arXiv:2008.08635 · doi:10.1103/PhysRevX.11.011042
Abstract
Artificial spin ices (ASIs) are interacting arrays of lithographically-defined nanomagnets in which novel frustrated magnetic phases can be intentionally designed. A key emergent description of fundamental excitations in ASIs is that of magnetic monopoles -- mobile quasiparticles that carry an effective magnetic charge. Here we demonstrate that the archetypal square ASI lattice can host, in specific regions of its magnetic phase diagram, high-density plasma-like regimes of mobile magnetic monopoles. By passively "listening" to spontaneous monopole noise in thermal equilibrium, we reveal their intrinsic dynamics and show that monopole kinetics are minimally correlated (that is, most diffusive) in the plasma phase. These results open the door to on-demand monopole regimes having field-tunable densities and dynamic properties, thereby providing a new paradigm for probing the physics of effective magnetic charges in synthetic matter.
arXiv comment12 pages, 5 figures, 4 supplemental figures
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Cited by in corpus (10)
- Dynamical fractal and anomalous noise in a clean magnetic crystal
- Topological Kinetic Crossover in a Nanomagnet Array
- Magnetic-Field-Dependent Thermodynamic Properties of Square and Quadrupolar Artificial Spin Ice
- Texture fluctuations and emergent dynamics in coupled nanomagnets
- Relaxation pathways and emergence of domains in square artificial spin ice
- Square ice Coulomb phase as a percolated vertex lattice
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- Frequency comb in a macroscopic mechano-magnetic artificial spin ice
- Mesoscopic critical fluctuations
- Unusual Coulomb phase physics in the arctic square ice