Iron-nitrogen compound forms strongest magnet known

A group of scientists from the University of Minnesota say that Fe₁₆N₂ crystals are more magnetic than the most magnetic material previously known, and its magnetism exceeds the predicted limit of magnetism for a material.

"A group of materials physicists from Twin Cities, Minnesota, led by Jian-Ping Wang have found a material comprising 16 iron atoms and two of nitrogen is approximately 18% more magnetic than the predicted limit."
 
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Iron-nitrogen compound forms strongest magnet known