The Collaborative International Dictionary
Demagnetizer
Demagnetize \De*mag"net*ize\, v. t.
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To deprive of magnetic properties; to render nonmagnetic. See Magnetize.
If the bar be rapidly magnetized and demagnetized.
--Am. Cyc. To free from mesmeric influence; to demesmerize. [archaic] [1913 Webster +PJC] -- De*mag`net*i*za"tion, n. -- De*mag"net*i`zer, n.
Wiktionary
demagnetizer
n. Any device (often a furnace) that is used to remove magnetization