| Superparamagnetic size limit in magnetic materials | |||||||
| V= | kTln(towm/towo)/K | towm/tow0= | 11.513 | From Mossbauer time scale | |||
| Superpara size | |||||||
| Material | K in J/m^3 | V in m^3 | R in m | R in nm | D in nm | comments | |
| Y3Fe5O12 | 6.11E+02 | 7.80491E-23 | 2.69775E-08 | 26.97749 | 54 | ||
| MnZnFe2O4 | 1.00E+03 | 4.7688E-23 | 2.28957E-08 | 22.89566 | 46 | mn0.66 | |
| MnFe2O4 | 4.00E+03 | 1.1922E-23 | 1.443E-08 | 14.43003 | 28 | ||
| Ni | 5.00E+03 | 9.5376E-24 | 1.33967E-08 | 13.39665 | 26 | ||
| FeCo | 5.70E+03 | 8.36632E-24 | 1.28247E-08 | 12.82469 | 26 | Fe70 | |
| CuFe2O4 | 6.00E+03 | 7.948E-24 | 1.26075E-08 | 12.6075 | 26 | ||
| NiFe2O4 | 6.90E+03 | 6.9113E-24 | 1.20342E-08 | 12.03418 | 24 | ||
| Fe3O4 | 1.10E+04 | 4.33527E-24 | 1.03031E-08 | 10.30314 | 20 | ||
| CrO2 | 2.50E+04 | 1.90752E-24 | 7.83861E-09 | 7.838613 | 16 | ||
| FeCo | 2.13E+04 | 2.23887E-24 | 8.26805E-09 | 8.268045 | 16 | Fe30 | |
| Fe | 4.80E+04 | 9.935E-25 | 6.30812E-09 | 6.30812 | 12 | ||
| CoFe2O4 | 2.70E+05 | 1.76622E-25 | 3.54903E-09 | 3.549026 | 8 | ||
| hcpCo | 5.30E+05 | 8.99774E-26 | 2.83511E-09 | 2.835107 | 6 | ||
| BaFe12O19 | 3.30E+05 | 1.44509E-25 | 3.31962E-09 | 3.319618 | 6 | ||
| SrFe12O19 | 3.50E+05 | 1.36251E-25 | 3.25521E-09 | 3.255207 | 6 | ||
| Sm2Fe17 | 8.00E+05 | 5.961E-26 | 2.47186E-09 | 2.471862 | 4 | ||
| Sm2Co17 | 3.30E+06 | 1.44509E-26 | 1.54201E-09 | 1.542013 | 4 | ||
| FePt | 6.60E+06 | 7.22545E-27 | 1.22418E-09 | 1.22418 | 2 | ||
| Nd2Fe14B | 5.00E+06 | 9.5376E-27 | 1.34275E-09 | 1.342753 | 2 | ||
| SmCo5 | 1.70E+07 | 2.80518E-27 | 8.93334E-10 | 0.893334 | 2 | ||