How Does Storing Magnets North to South Affect Their Longevity?

[personelsogno]

I guess I do have to ask some questions on magnet storage. Especially over long periods of time. Basically, I want to know what the effects are if you store (relatively strong) magnets north to south with a slight gap in between (roughly 50mm between).


N===S N===S N===S

That's pretty much the best crude ascii drawing I can do. Anywho, if there is an effect, what would it be relative to time and to distance apart?

 

[Meir Achuz]

That arrangement would tend to preserve the magnetization.
It would be better if they touched. 5 cm seems like too much.
The preserving effect depends on d^2/A(area). If this is not<<1, the effect would tend to fall off as 1/d^2.
The time dependence depends on temperature and the particular characteristics of the magnetic material.