Two replicas of a 2D Ising ferromagnet

Simulated on a square grid with Metropolis single-spin-flip algorithm and Periodic Boundary Conditions.

Overlap parameter q.

Colors:

White: spin up.

Black: spin down.

Red: spin ill-defined.

Green: background.

Legend:

m: intensive magnetization.

e: intensive energy.

Controls:

T, temperature: 2.269

H, magnetic field: 0.0

L, points per side: 128