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Wiktionary
demagnetise

alt. 1 (label en British spelling) To make something non-magnetic by removing its magnetic properties. 2 To erase the contents of a magnetic storage device. vb. 1 (label en British spelling) To make something non-magnetic by removing its magnetic properties. 2 To erase the contents of a magnetic storage device.

WordNet
demagnetise
  1. v. erase (a magnetic storage device) [syn: demagnetize]

  2. make nonmagnetic; take away the magnetic properties (of); "demagnetize the iron shavings"; "they degaussed the ship" [syn: demagnetize, degauss] [ant: magnetize, magnetize]