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.
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.
External field strength slider, auto-ramp play and pause toggle, ramp speed control, pinning defect density slider, audio on and off toggle for jump clicks, and a statistics panel toggle showing the live jump-size histogram and magnetization curve.
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.
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.
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.
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.
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.