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Demagnetizing field

by sokrates
Tags: demagnetizing, field
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sokrates
#1
May29-09, 12:59 AM
P: 483
Can anybody enlighten me on what demagnetizing field is and how it comes to existence?
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clem
#2
May29-09, 06:46 AM
Sci Advisor
P: 1,256
At the end of a bar magnet, H points in the opposite direction to M and B. This is due to the boundary condition on H at the end of a magnet. In many books, this is called a
"demagnetizing field". That is a misnomer, because it is B and not H that acts to polarize the atoms in the iron. Since B near the end of the magnet is 1/2 its value at the middle, there is some tendency for the magnet to lose a bit of its magnetization (M) over time.
sokrates
#3
May30-09, 01:26 AM
P: 483
I'll try to absorb what you said, and then come back.
Thanks for your post


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