soft iron

iron that has a low carbon content and is easily magnetized and demagnetized with a small hysteresis loss
(as modifier)a soft-iron core

Words nearby soft iron

The Morse telegraph sounder (Fig. 61) consists of an electromagnet and a soft-iron armature.

The Story of Great Inventions |Elmer Ellsworth Burns
A piece of brass wire, O, is soldered to the diaphragm disk B and the soft-iron armature H, to connect them solidly.

The Boy Mechanic, Book 2 |Various
He took a long piece of soft-iron wire and fed it into the hollow of the first magnet.

Astounding Stories of Super-Science January 1931 |Various
Of course you are aware that it is the electrons within the soft-iron core of the electro-magnet who produce the magnetic effect.

Autobiography of an Electron |Charles R. (Charles Robert) Gibson

The rotating coil, which usually contains a soft-iron core, is called the "armature."

The Story of Great Inventions |Elmer Ellsworth Burns