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Learning CenterWhat's the Difference Between Neodymium Magnets and Other Types of Magnets?
Neodymium magnets are the strongest for their size and the best value for most projects, but they need plating and standard grades top out at 80°C (176°F). Samarium cobalt handles more heat, alnico is very temperature-stable but easy to demagnetize, ferrite is cheapest and rust-proof but much weaker, and flexible magnets are thin and cuttable but weakest.
Magnet Types Compared
| Type | Relative strength | Max working temp | Corrosion | Brittleness | Cost |
|---|---|---|---|---|---|
| Neodymium (NdFeB) | Highest | 80°C standard; up to ~230°C special grades | Needs Plating | Brittle | Moderate |
| Samarium cobalt (SmCo) | High | ~250 to 350°C | Good | Very brittle | High |
| Alnico | Medium | ~450 to 550°C | Good | Tough | Moderate |
| Ferrite (ceramic) | Low | ~250°C | Excellent | Brittle | Lowest |
| Flexible (rubber) | Lowest | ~80°C | Good | Flexible | Low |
Which Should You Choose?
Most Projects
Neodymium. Smallest size for the holding power, easy to find in hundreds of sizes.
High Heat
High-temperature neodymium grades or samarium cobalt for motors, ovens or engine bays.
Low Cost, Large Size
Ferrite for fridge magnets, speakers and budget assemblies.
Size Check
Because neodymium is so strong, a neodymium magnet can often replace a ferrite magnet several times its size. That saves space and weight in your design.