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Determining a magnet's life?

T

Terry Pinnell

Jan 1, 1970
0
I've been pleased with this pair of 'magnetic' sandals I bought a
couple of summers ago. I just slip a foot into one, shake it a bit if
necessary, and the pair of magnets mounted in its strap automatically
fastens it securely with a sharp snap.

Anyone know the approximate 'life' of such magnets? Are we talking
decades, centuries or millennia?
 
R

Robert Baer

Jan 1, 1970
0
Terry said:
I've been pleased with this pair of 'magnetic' sandals I bought a
couple of summers ago. I just slip a foot into one, shake it a bit if
necessary, and the pair of magnets mounted in its strap automatically
fastens it securely with a sharp snap.

Anyone know the approximate 'life' of such magnets? Are we talking
decades, centuries or millennia?

Depends on the formulation.
Older ("first" generation) Alnicos were a bit "soft" and certain
storage conditions could make them lose some of their magnetization in a
few years.
AFAIK all new Alnicos and rare-earth types will last until they get
heated to or above their Curie point.
The "plastic" magnets are very wimpy and canot be trusted...
 
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