AlNiCo ring magnets are disc magnets with a plain hole through the center of the magnet. They are comprised of aluminum, nickel, cobalt, and iron with varying additions of other elements.
Production by casting or powder metallurgical techniques
An alloy composed of matrix of Al-Ni-Fe-Co
Excellent stability over a wide temperature range higher than 500°C, Temperature coefficient of Br and iHc <±0.03%
Strong corrosion resistance capability without coating for surface protection
Good resistance to demagnetization from vibration and shock
Good flux density at an reasonable cost
Very hard & brittle
| Curie Temperature (°C) | 860 |
| Maximum Operating Temperature(°C) | 525-550 |
| Resistivity (µ ohm.cm) | 47-54 |
| Hardness (Hv) | 520-630 |
| Density (g/cm3) | 6.90-7.30 |
| Relative Recoil Permeability (µrec) | 1.70-4.70 |
| Saturation Field Strength, kOe (kA/m) | 2.7-6.3 (215-500) |
| Temperature Coefficient of Br (%/°C) | -0.025 ~ -0.02 |
| Temperature Coefficient of iHc (%/°C) | +0.01 ~ +0.03 |