I have a bunch of rare earth magnets that I bought a few years ago. For the most part, they've been rather haphazardly stored in a jumbled mess, with a few others stuck on the refrigerator. Today I noticed that at least some of them are noticeably weaker (particularly noticeable with the strongest ones, as one would expect, I suppose). A quick Google search tells me that storing magnets near other magnets can weaken them, but I'm having difficulty finding more detailed information. I'm wondering if anybody can give me some suggestions for long term storage. I have far too many (hundreds) to store them individually, except perhaps for the larger ones. I've put like with like in long chains and stuck them on the refrigerator (rather than just a jumbled mess), but I don't know if this is accomplishing anything useful. How much of a difference does storing them on a ferrous surface (like a refrigerator) make as opposed to storing them in isolation or attached to one another? Also, there must be some nice equations or something out there that describe this degradation. Can anyone enlighten me? Thanks.