PPolySim OS

Ising Model

Watch a magnet lose its magnetism. Cool the lattice and spins align into domains; heat it past the critical point and order dissolves into noise.

Ising Model StudioLive

Controls

Below the critical temperature (~2.27) domains align; above it, thermal noise wins. A live phase transition.

Presets

▶ Run in Python

Data Inspector

Lattice150×150
Magnetization0.000
T_critical≈ 2.27
Phaseordered

Governing equation

Reading this result: Right at the critical point (T_c ≈ 2.27): order and disorder are in balance. Correlated clusters appear at every length scale — the hallmark critical fluctuations of a second-order phase transition.

Runs locally in your browser — free forever. Scale to the cloud when reality gets heavy.

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How it works

The 2D Ising model is simulated with the Metropolis Monte Carlo algorithm: spins flip with a probability set by the energy change and temperature. It exhibits a genuine phase transition at the critical temperature (≈ 2.27 J/k_B) — a cornerstone of statistical mechanics you can watch happen live.

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The math, the assumptions, real-world uses, or a code translation — explained for this exact simulation.

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Frequently asked questions

Is this Ising model simulation tool really free?
Yes. Ising Model runs entirely in your browser using your device's own compute, so local use is free forever. You only pay Compute Tokens if you scale a job to the cloud.
Do I need to install anything?
No. Everything runs client-side in a modern browser — no downloads, no license, no account required to start.
Can I save or share my simulation?
Create a free account to save projects, and use a shareable embed or minted DOI to publish a live, interactive version anywhere.
How accurate are the results?
The solver uses established numerical methods, but results are for research and educational purposes and should be validated against experiment or professional review before you rely on them.