MAXIMA Power magnets are permanent, super-strong rare earth magnets at Magnetics & Magnets For Sale. Samarium Cobalt Magnets are slightly more expensive than the popular strong neodymium magnets, with a slightly weaker magnetic field strength.Â However, SmCo magnets are the best choice for many applications due to their superior ability to retain their magnetic strength at high temperatures. Powerful Samarium Cobalt magnets are also far more resistant to corrosion and oxidation than other rare earth magnets, so they do not require protective coatings. However, these magnets must be handled with care because they are brittle and may crack or chip. Call now and order yourÂ Magnets today!