Permindur Permendur

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Permindur (Permendur)


an alloy that contains iron and 48 to 50 percent cobalt, usually with an additive of up to 2 percent vanadium. Permindur, which is classified as a soft-magnetic material, is characterized by a high saturation magnetization and an increased magnetic permeability μ at high magnetic flux densities. It was developed in the USA in the late 1920’s. Compared with iron and electric steel, Permindur has higher values of μ in magnetic fields that exceed 4 amperes per cm (A/cm); it also has a higher saturation magnetization (2.40–2.45 tesla) and Curie point (980°C). In a magnetic field of 4 A/cm, the value for μ in Permindur exceeds 4,000.

Permindur is used to make electric parts, for example, pole shoes for electromagnets, rotor plates for miniature electric motors, and telephone diaphragms.


Bozorth, R. Ferromagnetizm. Moscow, 1956. (Translated from English.)
Materiaiy v priborostroenii i avtomatike: Spravochnik. Moscow, 1969.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.