Dynamics of Bound Monopoles in Artificial Spin Ice: How to Store Energy in Dirac Strings.
E. Y. Vedmedenko
Phys. Rev. Lett. 116, 077202 (2016)
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| (a, b) Examples of microscopic configurations used for static
calculations. Color scheme gives the energy per dipole. (c) Total energy
cost due to formation of DSs of length r in a sample 200a×200a. Numerical data (dots) are fitted by Eq. (1) with T0≈7.3w/a and γ≈0.5wa. The inset gives the difference between the total potential and the linear term T0r. (d) Spatial energy profile along the DSs of panel (a) and schematic drawing of T1 and T2
vertices. (e) Interaction potential between two BMs of opposite sign in
different backgrounds calculated analytically (dots). Lines are fits by
function γ/r with γ≈1/2. The γ/r term is repulsive. |
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