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🧲 The Barkhausen Effect: Domain Jumps Lab

Explore why magnetizing a piece of iron isn't smooth: watch magnetic domains snap past pinned defects in discrete jumps, hear the crackle of Barkhausen noise, and see how jump-size statistics reveal a power law.

Physics & Mechanics3DModerate60 FPS⚡ Plasma

This simulator visualizes a two-dimensional slice of a ferromagnetic material containing randomly placed pinning defects and mobile domain walls. As you ramp an external field, walls advance in discrete jumps whenever the driving force overcomes local pinning strength, and each jump is logged and played as an audible click, reproducing the essential physics behind Barkhausen's original 1919 discovery and showing how the aggregated jump sizes build up into a power-law distribution.

🔬 What It Demonstrates

🎮 How to Use

Use the field slider or the auto-ramp control to slowly increase the external magnetic field from zero. Watch the domain map as walls bulge, snag on pinning sites shown as small markers, and then suddenly jump forward. Toggle the audio to hear each jump as a click, and open the statistics panel to see a live histogram of jump sizes plotted on logarithmic axes, along with the overall magnetization curve building up step by step.

💡 Did You Know?

Heinrich Barkhausen's 1919 discovery used nothing more sophisticated than a coil, a vacuum-tube amplifier, and a telephone earpiece, yet it provided the first direct experimental evidence that ferromagnets contain discrete magnetic domains, decades before domain walls could actually be imaged, and its power-law statistics later turned out to connect kitchen-magnet physics to the same mathematics that describes earthquakes and avalanches.

⚙ Under the hood

magnetismcondensed matterferromagnetismdomain wallspower lawnondestructive testingself-organized criticalitymaterials science

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install