Table 4.
Magnetization values calculated from Field Cooled/Zero Field Cooled (FC/ZFC) and hysteresis curves. Tbm—superparamagnetic blocking temperature (H–M—Hansen and Mørup model; M—Micha et al. model); Mrs—remanence; Ms—saturation magnetization; Hc—coercive field; χhf—high field susceptibility. Column MS describes blocking temperatures determined from Mössbauer spectroscopy.
| Sample | MS | Tbm (K) ± 1 |
Mrs (A·m2/kg) ± 0.5 |
Ms (A·m2/kg) ± 0.5 |
Hc (mT) ± 0.5 |
|||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| H-M | M | 2 K | 10 K | 300 K | 2 K | 10 K | 300 K | 2 K | 10 K | 300 K | ||
| Mn0.20 | >RT | 169 | 5.6 | 28.4 | 20.5 | 0.2 | 88.6 | 88.7 | 68.1 | 29.4 | 19.7 | 0.1 |
| Mn0.20 500 °C | >RT | 243 | 84.9 | 27.9 | 25.4 | 0.1 | 65.6 | 65.6 | 55.3 | 44.7 | 38.4 | 0.1 |
| Mn0.15 | >RT | >300 | 299 | 22.7 | 18.1 | 0.6 | 82.4 | 82.5 | 67.0 | 23.3 | 18.0 | 0.4 |
| Mn0.15 500 °C | >RT | >300 | 113 | 23.0 | 21.5 | 0.3 | 57.9 | 57.7 | 50.7 | 38.3 | 34.4 | 0.2 |
| Mn0.10 | >RT | >300 | 299 | 20.9 | 17.9 | 2.1 | 85.4 | 85.4 | 69.7 | 21.5 | 18.2 | 1.6 |
| Mn0.10 500 °C | >RT | >300 | 116 | 23.2 | 21.4 | 1.7 | 68.3 | 68.3 | 60.1 | 31.5 | 28.5 | 1.4 |
| Mn0.05 | >RT | >300 | 299 | 17.8 | 15.3 | 3.6 | 68.1 | 68.0 | 59.1 | 24.4 | 20.8 | 3.5 |
| Mn0.05 500 °C | >RT | >300 | 299 | 18.4 | 17.6 | 3.5 | 53.4 | 53.4 | 47.2 | 30.8 | 29.2 | 3.6 |
| Co0.05 | >RT | >300 | 299 | 50.8 | 49.5 | 11.3 | 70.3 | 70.2 | 59.7 | 512 | 480 | 23.0 |
| Ni0.05 | >RT | >300 | 299 | 22.7 | 19.9 | 2.8 | 76.5 | 76.9 | 70.1 | 24.2 | 21.1 | 2.0 |