1) Possessing both magnetisation of solid magnet material and flowability of liquid, it is widely used in engineering fields, such as sealing, lubracation, damping, etc.

2) To control the magnetisation and to avoid problems by remaining synchronous with the grid frequency.

3) The direction of magnetisation will change in core a only, thus storing a binary digit.

4) As far as a group of identical magnetic grains is concerned the laboratory unblocking temperature is not necessarily equal to the blocking temperature associated with the magnetisation.

5) In a permanent magnet brushless motor, airgap field excited by a 2-pole magnet ring with parallel magnetisation is sinusoidal.