Properties, Units and Constants in Magnetism

Gaussian to SI Multiply by To Obtain Flux density, B G 10-4 T Field strength, H Oe 103/4π A/m Magnetization, M G or Oe 103 A/m Magnetization, 4πM G 10-4 T Susceptibility(M/H), χv emu·cm-3Oe-1 4π (no dim.) Mass susceptibility, χg emu·g-1Oe-1 4π·10-3 m3/kg Magnetic moment, µ erg/G (=emu) 10-3 J/T (=A·m2) Specific magnetization, σ emu/g 4π·10-7 T·m3/kg Demagnetizing Factor, N (no dim.) 1/4π (no dim.) Flux, Φ maxwell 10-8 Wb Antisotropy constant, K erg/cm3 10-1 J/m3 Useful Constants Gaussian SI µo 1 (no dim.) 4π x 10-7 H/m (=T·m/A) µB 9.274015 x 10-21 erg/G 9.274015 x 10-24 J/T µN 5.050787 x 10-24 erg/G 5.050787 x 10-27 J/T µB/k 0.671710 x 10-1 K/G 0.671710 K/T NAµB 5.584939 x 10-3 erg·G-1mol-1 5.584939 J·T-1mol-1 Φo (=h/2e) 2.067835 x 10-7 maxwell 2.067835 x 10-15 Wb Ferromagnetic elements Fe(bcc) Co(fcc) Co(hcp) Ni(fcc) Gd(hcp) Tc (K) 1044 1388 1360 627.4 293.4 µat at 0 K (µB) 2.217 1.753 1.721 0.6157 7.56 σs at 0 K (emu/g) 221.7 166.1 163.1 58.57 268.4 σs at 298 K (emu/g) 217.2 164.8 161.8 55.09 0 NMR νr at 0 K (MHz) 46.64 228 217 28.46 48.6,64.2 ρ at 298 K (g/cc) 7.875 8.793 8.804 8.912 7.898 A (g/mol) 55.847 58.993 58.993 58.71 157.25