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Thread: Shielding Permanent Magnets

  1. #1 Shielding Permanent Magnets 
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    Is it possible to redirect most of a permanent magnet's flux lines (using a magnetic shielding material such as mu-metal) so that they stay fairly close to the magnet itself?

    In other words...



    This is just a very rough diagram to clarify what i'm asking. I'm aware of the likely improbability of completely redirecting all of the flux lines, but is it possible to significantly diminish them, on one side of the magnet, as illustrated above?

    Thanks a lot for any input


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  3. #2  
    Forum Junior Vroomfondel's Avatar
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    Im not too big on magnets, but i think if you put a high permeability alloy near a magnet a magnetic field is induced in the alloy rather than redirected. TBH im not even sure its possible to shield a magnetic field.


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  4. #3  
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    Thanks Vroomfondel, anyone else have any idea how or whether this could be accomplished?
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  5. #4  
    Forum Professor Zwolver's Avatar
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    Hmm, you can isolate or superconduct the field.

    Put another electromagnetic field next to it and you can change the path. It might even be possible to use thermo radiation to deactivate one side of the magnet or activate it (don't know if electromagnetic radiation increases or decreases due to warmth)
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  6. #5  
    Forum Junior Vroomfondel's Avatar
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    Quote Originally Posted by Zwolver
    Put another electromagnetic field next to it and you can change the path. It might even be possible to use thermo radiation to deactivate one side of the magnet or activate it (don't know if electromagnetic radiation increases or decreases due to warmth)
    If you were to put an electromagnet next to it then the increased power of the the "redirected" field would be equal to the power of both of the magnets together. This is because of the Principle of superposition in a magnetic field. If therm radiation were used to shut down half the magnet, then the shut down half would be like the alloy except right next to the magnet, and the overall strength of the magnet will decrease in all directions.
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  7. #6  
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    Anyone else have any ideas to offer up?
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