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In terms of environmental performance, both neodymium iron boron magnets and samarium cobalt magnets have certain environmental performance, but which one is more environmentally friendly may need to be evaluated based on specific applications and manufacturing processes.

The production process of neodymium iron boron magnets may generate pollutants such as wastewater, exhaust gas, and waste residue, which have a certain impact on the environment. However, with the improvement of environmental awareness and technological progress, the production process of neodymium iron boron magnets has adopted a series of environmental protection measures, such as wastewater treatment, exhaust gas purification, waste residue recovery, etc., to reduce the impact on the environment. In addition, neodymium iron boron magnets themselves also have certain environmental performance, such as their small size, light weight, and strong magnetism, which can reduce material usage and energy consumption in certain applications.

Samarium cobalt magnets also have good environmental performance. It does not contain harmful substances such as lead and mercury, and meets environmental requirements. In addition, samarium cobalt magnets can maintain stable magnetic properties at high temperatures. Therefore, in some applications that require high-temperature environments, the use of samarium cobalt magnets can reduce energy consumption and minimize environmental impact

Overall, whether it is neodymium iron boron magnets or samarium cobalt magnets, certain environmental measures can be taken during the manufacturing and use process to reduce their impact on the environment. When choosing a magnet, in addition to considering its magnetic properties and stability, one can also consider its environmental performance and choose magnet materials that better meet environmental requirements.