From Wikipedia, the free encyclopedia
Jump to: navigation, search

Bismanol is an alloy of Bismuth, Manganese and Iron developed by the US Naval Ordnance Laboratory. It was used to make permanent magnets for use in small electric motors.[1]

Bismanol magnets have been replaced by Neodymium magnets which are both cheaper and superior in other ways, Samarium-Cobalt magnets in more critical applications, and Alnico magnets.

Bismuth use in permanent magnets and permanent magnet electric motors[edit]

Around 50 years ago, the US Naval Ordnance Laboratory developed the permanent magnetic alloy "Bismanol", which is a Bismuth-Manganese-Iron alloy. Bismanol has very high coercive force and moderate energy density, making it a good choice for small electric motors[citation needed].

Currently Bismuth isn't used for magnetic alloys.


  1. ^ Adams, Edmond (1953). "A New Permanent Magnet from Powdered Manganese Bismuthide". Rev. Mod. Phys. 25 (1): 306–307. doi:10.1103/RevModPhys.25.306.