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Determining a magnet's life?

Discussion in 'Electronic Design' started by Terry Pinnell, Feb 11, 2005.

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  1. 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?
  2. Robert Baer

    Robert Baer Guest

    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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