Magnetic Susceptibility
A dimensionless material property measuring the degree of magnetization induced in a material per unit applied magnetic field strength.
Governing formula
M = χ_m H, μ_r = 1 + χ_m
SI unit
Dimensionless
In depth
Negative for diamagnets (χ_m < 0), small positive for paramagnets (χ_m > 0), and large positive for ferromagnets (χ_m ≫ 0).
Examples in the real world
Geophysical magnetic susceptibility meters classifying rock and mineral specimens in geological surveying.