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In response, Apple says: "Smartphones and other items contain magnets or components that may have a risk of demagnetizing low coercivity cards. To prevent this from happening, users should keep these cards stored separately."

That meant she ensured that ships were demagnetized so they were less susceptible to damage from magnetic mines.

Pumping too much current into the device would cause it to overheat and demagnetize.

They found that the bricks were completely demagnetized at the temperature at which they had been burned -- proving that the method works.

The researchers were then able to demagnetize the layer again with a series of weaker laser pulses.