Long term magnetic repulsion with permenant magnets?

AI Thread Summary
Neodymium magnets, while known for their strong magnetic properties, can weaken over time when exposed to opposing magnetic fields. The degree of demagnetization is influenced by the material's coercivity and temperature. Neodymium magnets have a coercivity of 1.2, indicating they retain their strength longer than many other materials under similar conditions. However, they are not truly permanent and will lose strength eventually. Understanding these factors is crucial for projects involving magnetic levitation.
carmatic
Messages
89
Reaction score
0
i have a set of neodynium magnets which i am using for a magnetic levitation project... will the constant exposure to an opposing magnetic field weaken the magnets over time? are 'permenant' magnets really permenant?
 
Physics news on Phys.org
The reverse magnetic field can tend to demagnetize. The extent depends on the material of the magnet and temperature.
 
the coercivity of neodymium is 1.2 , which is supposed to be greater than most materials... this means that , in the same conditions, neodymium would keep its magnetic strength for longer than most materials, but not indefinitely?
 
Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

Thread 'Motional EMF in Faraday disc, co-rotating magnet axial mean flux'

So here is the motional EMF formula. Now I understand the standard Faraday paradox that an axis symmetric field source (like a speaker motor ring magnet) has a magnetic field that is frame invariant under rotation around axis of symmetry. The field is static whether you rotate the magnet or not. So far so good. What puzzles me is this , there is a term average magnetic flux or "azimuthal mean" , this term describes the average magnetic field through the area swept by the rotating Faraday...
View full post »

Similar threads

I Questions related to magnetic shielding separating two like poles
Replies
6
Views
779
I How Does a Magnetic Repulsion Machine Work?
Replies
5
Views
2K
I Charge movement relative to magnetic field frame dependence/invariance
Replies
5
Views
847
Magnetic attraction and repulsion equivalence
Replies
8
Views
11K
B Experiment issues (electromagnetism)
Replies
42
Views
2K
I How induction works within a coil (nuances of it)
Replies
6
Views
2K
B Do materials surrounding magnets affect how superconductors levitate?
Replies
5
Views
1K
Magnetic Repulsion for a Loudspeaker Motor
Replies
8
Views
7K
A NMR flip angle - angle of nutation
Replies
2
Views
1K
B Basic Straight Line Permanent Magnet Accelerator
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top