are there any particles that carry magnetic charge, and if so , why are they so difficult to detect/?

Answer 1

No known particles carry any magnetic charge--that is, we do not know of any magnetic monopoles. That there should be no magnetic charges is actually built into Maxwell's equations, since one of these equations states that the divergence of the magnetic field is zero.

However, the divergence-free nature of the magnetic field gives Maxwell's equations a certain amount of asymmetry, so it's natural to wonder whether these equations are completely accurate. Moreover, Dirac discovered that, if magnetic charges do exist, then their existence would actually explain why electric charge is quantized. So there are some reasons to hope that magnetic charges do exist.

Unfortunately scientists have come up emtpy-handed in their search for such particles. If magnetic monopoles exist, I do not know why they are difficult to detect, so I cannot answer that part of your question. I hope the rest was helpful though.

Answer 2

I think that all particles carry some magnetic charge if it has a proton or electron. The reason it is so hard is because there are so many particles and every one of them has a charge.

Answer 3

There was a theorized particle called a magnetic monopole which could be either a north or south pole. None were ever detected and the theory got replaced.