Historical trends in the maximum energy product of permanent magnets (MGOe units).
In magnetics, the maximum energy product is an important figure-of-merit for the strength of a permanent magnet material. It is often denoted (BH)max and is typically given in units of either kJ/m3 (kilojoules per cubic meter, in SI electromagnetism) or MGOe (mega-gauss-oersted, in gaussian electromagnetism).[1][2] 1 MGOe is equivalent to 7.958 kJ/m3.[3]
During the 20th century, the maximum energy product of commercially available magnetic materials rose from around 1 MGOe (e.g. in KS Steel) to over 50 MGOe (in neodymium magnets).[4] Other important permanent magnet properties include the remanence (Br) and coercivity (Hc); these quantities are also determined from the saturation loop and are related to the maximum energy product, though not directly.
^"What is Maximum Energy Product / BHmax and How Does It Correspond to Magnet Grade? | Dura Magnetics USA". 15 September 2014. Retrieved 2020-01-20.
^"Glossary of Magnet Terminology". K&J Magnetics. Retrieved 2021-01-31.
^eFunda: Glossary: Units: Energy Density Units: Megagauss-Oersted (MG⋅Oe)
^"COBALT: Essential to High Performance Magnetics" (PDF). Arnold Magnetic Technologies. 2012.
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