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Here is an very interesting macroscopic engineering of the Barkhausen effect.
When a ferromagnetic material is subjected to a magnetic field, its domains align to the field, however not in a smooth gradient. Rather, domains "snap" into place as the core reaches sturation. This is called the Barkhausen effect.
Mr. Wiegand recreated this effect in a macroscopic sense by creating a "wire" which acts as one large magnetic domain. As a magnetic field increases near the wire, the domains, all at once snap into position, creating a large uniform pulse. This could be referred to a magnetic avalanche mode.
I found this very very interesting, and immediately thought of applications. Wiegand wire is generally several mills thick, however I would imagine that creating a larger version would be much easier than attempting to manufacture the wire itself. Imagine creating electromagnet cores, which go to avalanche mode when a predetermined level of saturation is reached, causing the entire core to suddenly flip its polarity independent of the speed of change of the magnetic field which initiated the flip!
Wiegand effect : Define, Explore, Discuss
Popular Science - Google Books
The Barkhausen Effect experiment by Jean-Louis Naudin
Here is an enlightening quote from Naudins experiments on the Barkhausen Effect which if hold microscopically true, could infer a macroscopic correlation.
"The most interesting in the Barkhausen effect is that there are no magnetic links between the source (the 2Hz flat excitation coil) and the EM induction produced by the Barkhausen jumps inside ferrite toroid core. So, this can be a path to explore for building Free Energy generators due to this non reciprocal effect (see the Bakhausen scalar detector from Bob Shannon)."
When a ferromagnetic material is subjected to a magnetic field, its domains align to the field, however not in a smooth gradient. Rather, domains "snap" into place as the core reaches sturation. This is called the Barkhausen effect.
Mr. Wiegand recreated this effect in a macroscopic sense by creating a "wire" which acts as one large magnetic domain. As a magnetic field increases near the wire, the domains, all at once snap into position, creating a large uniform pulse. This could be referred to a magnetic avalanche mode.
I found this very very interesting, and immediately thought of applications. Wiegand wire is generally several mills thick, however I would imagine that creating a larger version would be much easier than attempting to manufacture the wire itself. Imagine creating electromagnet cores, which go to avalanche mode when a predetermined level of saturation is reached, causing the entire core to suddenly flip its polarity independent of the speed of change of the magnetic field which initiated the flip!
Wiegand effect : Define, Explore, Discuss
Popular Science - Google Books
The Barkhausen Effect experiment by Jean-Louis Naudin
Here is an enlightening quote from Naudins experiments on the Barkhausen Effect which if hold microscopically true, could infer a macroscopic correlation.
"The most interesting in the Barkhausen effect is that there are no magnetic links between the source (the 2Hz flat excitation coil) and the EM induction produced by the Barkhausen jumps inside ferrite toroid core. So, this can be a path to explore for building Free Energy generators due to this non reciprocal effect (see the Bakhausen scalar detector from Bob Shannon)."
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