At room temperature, a pure bar of neodymium wouldn’t be ... The most common rare-earth magnet alloy, a combination of iron, neodymium, and boron, has a Curie temperature in the range of 300-400 ...

Only certain materials, such as iron, feel a magnetic force. Permanent magnets can come in lots of different shapes and sizes. Bar magnets and horseshoe magnets are two of the most common shapes ...