Nambu monopoles interacting with lattice defects in two-dimensional artificial square spin ice
arXiv:1208.2854 · doi:10.1103/PhysRevB.87.014414
Abstract
The interactions between an excitation (similar to a pair of Nambu monopoles) and a lattice defect are studied in an artificial two-dimensional square spin ice. This is done by considering a square array of islands containing only one island different from all others. This difference is incorporated in the magnetic moment (spin) of the "imperfect" island and several cases are studied, including the special situation in which this distinct spin is zero (vacancy). We have shown that the two extreme points of a malformed island behave like two opposite magnetic charges. Then, the effective interaction between a pair of Nambu monopoles with the deformed island is a problem involving four magnetic charges (two pairs of opposite poles) and a string. We also sketch the configuration of the field lines of these four charges to confirm this picture. The influence of the string on this interaction decays rapidly with the string distance from the defect.
7 pages, 13 figures
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- Defect Dynamics in Artificial Colloidal Ice: Real-Time Observation, Manipulation and Logic Gate
- Dynamics and hysteresis in square lattice artificial spin-ice
- Thermally and field-driven mobility of emergent magnetic charges in square artificial spin ice
- Realization of Rectangular Artificial Spin Ice and Direct Observation of High Energy Topology
- Vortex-crystal pattern in an anti-artificial spin ice system
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- Controlled creation and annihilation of stringless robust emergent magnetic monopoles in artificial spin ice