To arrive at a true “best fit” for this application, we’ll need to explore additional considerations, including cost, longevity, and unique shape requirements that may add cost and/or create installation issues. The high magnetic strength of neodymium made it initially attractive and the significantly higher operating temperature of samarium cobalt was an intriguing option. As you can see, there isn’t an easy ‘one size fits all’ solution to our customer’s application. At first glance, this makes sense, but it fails to take into consideration mechanical strength-remember, samarium cobalt magnets are brittle. Our customer was also interested in samarium cobalt due to the material’s higher maximum operating temperature. The application will also subject the magnets to high temperatures that exceed the maximum operating temperature for most grades of neodymium. In this case, our customer inquired about a neodymium magnet because his application required a high strength part that would function through a gap (magnets typically don’t work well through gaps). The differences and potential trade-offs between neodymium and samarium cobalt rare earth magnets are perfectly illustrated by a recent customer phone call. Ultimately, selecting the proper rare earth magnet is application driven, and your best bet is to speak with an engineer to discuss your specific needs. The different magnetic and physical properties of these two magnetic alloys means that choosing the proper rare earth magnet is more complex than locating an online vendor offering a suitable size. Samarium cobalt is often the rare earth magnet alloy of choice for high strength/ high temperature applications. Samarium cobalt also sets itself apart from other magnet materials (including neodymium iron boron) because of its capacity to function at elevated temperatures up to 662☏. Due to this physical characteristic, designers and engineers must exercise great care when integrating samarium cobalt magnets with a given application. Other than the fact that both are called rare earth magnets, there are few similarities between samarium cobalt and neodymium iron boron. Samarium cobalt offers the second highest energy density, with BHMax values ranging from 16 to 32 MGOe, but SmCo magnets are also very brittle. Alternative high temperature grades of neodymium iron boron and various surface treatments are available when the rigors of the application demand it. Ignoring important characteristics such as operating temperature or the magnet’s ability to withstand corrosion may cause premature failure and substandard performance. ![]() Although the smaller magnets and increased savings associated with neodymium might suggest choosing a high strength neodymium magnet is the best choice for all applications, this is not always the case. ![]() This physical property allows designers to use relatively small amounts of magnetic alloy when compared to other magnetic materials. Of all magnetic materials (including other rare earths), neodymium iron boron offers the highest available magnetic energy density with (BH)Max values ranging from 33 to 52 MGOe. Here at Dura, the neodymium iron boron we supply is licensed and compliant to all applicable patents. It’s also important to know that there are hundreds of patents covering the production of sintered neodymium iron boron magnets. Since its inception, neodymium iron boron has undergone a numerous enhancements, and today, this material is the most popular and widely used magnet alloy. Over 30 years ago, neodymium magnets were developed by General Motors and Sumitomo Specialty Metals in response to the rising cost of samarium cobalt. Both of these magnetic alloys utilize rare earth elements as the magnetic constituents and the characteristics offered by both material types lend themselves to specific applications. The term rare earth magnet is a generic name used to describe two types of magnetic material: samarium cobalt and neodymium iron boron.
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