Neodymium-Iron-Boron magnets have a relative magnetic permeability of 1.05. According to the formula: B = μ0 * (H + M) Both the magnetizing field H and the magnetization M contribute to the magnetic field B. The magnetization M has sources and sinks, so therefore it follows from Maxwell's equations that H also has sources and sinks. Since Neodymium magnets have magnetic permeability close to unity, then its value of M must be small relative to the value of H. The magnetization current is equal to ∇ × M. So does that mean that Neodymium Magnets have less magnetization current than soft magnetic materials possessing the same strength? That doesn't make sense to me. Why should magnetization current of a Neodymium magnet be less than that of, say, high permeability silicon steel of the same B field intensity? Is this "magnetization current" the actual magnetization current, or not? Or does it make sense to say that H fields of Neodymium magnets are due to "free electrical currents" somehow sustained internally inside the Neodymium magnets?