Rare-earth magnet

High school (ages 12+)
Science & Technology

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/rare-earth-magnet

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. Who discovered Rare-earth magnet?Significant research and development in the 1970s and 1980s
2. What is the primary magnet types?Neodymium magnets (NdFeB) and Samarium-Cobalt magnets (SmCo)
3. What is the global production leader?China produces approximately 90% of the world's rare-earth magnets
4. What makes rare‑earth magnets super strong?They are made from alloys of rare‑earth elements like neodymium and samarium mixed with iron, cobalt, and boron. This combination gives them a magnetic field stronger than 1.2 teslas, making them the strongest permanent magnets.
5. Why are rare‑earth magnets called "rare" even though they aren’t that rare?The name is a misnomer. These elements are not very scarce, but they are hard to find in concentrated forms, so extracting them is difficult.

Magnetic Anisotropy: The directional dependence of a material's magnetic properties, crucial for strong permanent magnets.
Coercivity: A measure of a magnetic material's resistance to changes in its magnetization.
Energy Product: A measure of the maximum magnetic energy a permanent magnet can store, indicating its overall strength.
Alloy: A metallic substance formed by combining two or more elements, typically to enhance properties like strength or corrosion resistance.