permanent magnet

noun
a magnet that retains its magnetism after being removed from an external magnetic field.

Origin:
1820–30

permanent magnetism, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
permanent magnet
 
n
a magnet, often of steel, that retains its magnetization after the magnetic field producing it has been removed
 
permanent magnetism
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
permanent magnet   (pûr'mə-nənt)  Pronunciation Key 
A piece of ferromagnetic material that retains its magnetism after it has been magnetized.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Then when a permanent magnet is moved over the area, the clips or filings will
  bunch together and hump up to a peak.
The power plant is a permanent magnet synchronous electric motor.
Unlike a permanent magnet, an electromagnet creates a magnetic field when an
  electric current is applied to it.
Permanent magnet alternators are simpler, cheaper, and much more productive
  than in the past thanks to better magnet technology.
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