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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