Sunday, March 20, 2016

Increased dispersion of magnetic field energy due to ferromagnetic component in neodymium magnets

In this magnetic simulation it was observed an interesting effect caused by a ferromagnetic component inside a neodymium magnet. The magnetic energy of the air around it had an increase when two pieces of iron were placed inside the magnet, but the total of magnetic energy was not changed, them you could say that the magnetic field was better dispersed. This effect happens when the magnet without the ferromagnetic component has a gap in it, as seen by the pictures bellow:
Air- Magnetic field energy of air is 
8.16778 Joules

Iron- Magnetic field energy of air is
8.87539 Joules
Now, what if you had a magnet that doesn't have the air gap when tested without an iron component? Well let's try it by filling the space with cooper metal. Ok, that would not work because the cooper metal would have more magnetic field energy concentrated in one spot, increasing the total magnetic field energy! Here is the data:
Cooper component:
Total field energy: 12.8256 Joules
Air field energy: 4.33302 Joules     
Iron component:
Total field energy: 12.5762 Joules
Air field energy: 4.14083 Joules                 
With this data we can see that this experiment is not accurate because of the concentrated field energy due to the cooper component, and with that damaging the data of the simulator because the air around the magnet is not infinite. So this method cannot be used to determinate the increase of dispersion.

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