Rare earth magnet

(Neodymium magnet)

A permanent magnet made using a rare earth element (group 3 elements excluding actinium, or alternatively lanthanoid). A major feature of rare earth magnets is that the remanence (residual magnetic flux density B_R) is very high and the coercive intensity (H_C) is very strong.　The graph below shows the B-H characteristics of various kinds of rare-earth magnets, which are referred to as demagnetization characteristics. The intersect with the vertical axis is B_R, and that with the horizontal axis is H_C.