What do the specific parameters physically mean, and what are their units?
Hc and Hci specifically relate to how difficult it is to demagnetize the material. If an application has strong fields which apply a large reverse field, and then a higher value for Hci(and similarly, Hc) is necessary if the magnet is to do its job. There are two sets of units in use today; the CGS system and the SI system. The CGS unit for B (and M) is the Gauss (G) and the SI unit is the Tesla (T). BHmax is calculated by multiplying all of the discrete B and H pairs (BxH) and finding what H value produces the largest product of B times H – this is sometimes phrased “the area of the largest rectangle, which can fit underneath the normal demagnetization curve”. This “maximum energy product” is a crude figure of merit for magnetic materials and it represents the maximum energy, which can be stored inside the magnet. BHmax has the CGS unit of GaussOersted (GOe), but a million of these (MGOe) is more traditional, and the SI unit is joule per cubic meter (J/m3), but a thousand of these is
