demagnetize

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It is activated when the children get on the lift, and demagnetised at the top so they can disembark easily.
The researchers progressively demagnetised the rock until they found the magnetization that they believed to be the oldest remnant of a magnetic field.
The geophysics highlighted the structural complexity of the area with a number of demagnetised "dead zones", where magnetite in the rock has been destroyed by chemical reactions from a potential gold bearing fluid moving through the rock package which is another ideal trap for gold.