दुर्लभ-पृथ्वी चुंबक मिश्र धातुओं से बने मजबूत स्थायी चुंबक होते हैं। दुर्लभ-पृथ्वी तत्व. Developed in the 1970s and 1980s, the most common types are neodymium magnets (NdFeB) and samarium–cobalt magnets (SmCo). They are the strongest type of permanent magnets made, producing significantly stronger magnetic fields than ferrite or alnico magnets, enabling miniaturization and improved performance in many प्रौद्योगिकियों. Note: the term ‘rare-earth element’ is a historical misnomer. These elements are not exceptionally rare in the Earth’s crust. Cerium, the most abundant, is the 25th most abundant element, similar to copper. Even the least abundant stable दुर्लभ पृथ्वी, lutetium, is nearly 200 times more common than gold. The ‘rare’ label arose because they were difficult to separate.
