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Neodymium-iron-boron magnets: This type of rare earth magnet has an extremely high magnetic saturation, good resistance to demagnetisation and the highest value of energy production They are less costly to produce than Sm-Co alloys and hence are now the main rare earth permanent magnet in use today.
Prior to using the ferromagnetic inks for attaching to human skin, the ink material may be exposed to elevated temperatures to cause demagnetisation," the Telegraph quoted Nokia as saying in the US patent application.
From the geophysical interpretation the better targets appear to be away from the Island where more structural complexity and demagnetisation is seen.
The neodymium magnetics additionally offer greater resistance to demagnetisation, assuring users of repeatable performance throughout the motor's life.