[gurpal (OP)]

gurpal asked the Naked Scientists:
   
How can the magnetic force field be broken and the force field be taken out of a magnet without heating it over the curie temperature?

What do you think?

[Soul Surfer]

Physical shocks and probably high levels of ultrasound can also disturb the atomic alignments that cause ferromagnetism and reduce the power of a magnet but as long as you keep below the curie temperature a small residual field will probably remain

[syhprum]

Susceptible magnetic materiel's are converted into magnets by exposing them to a strong magnetic field normally generated by an electromagnet.
When they are removed from this field they retain a proportion of the strength of the magnetizing field.
This magnetic property can be removed by exposing the magnets to and alternating magnetic field sufficiently strong to reverse the polarity of the magnet and steadily reducing this field to zero.
This is the manner in which the 'degaussing coil' in a TV works that makes the familiar 'bong' when it is first switched on. 

[NingboSSD]

many ways to destroy the magnetism of a magnet.
Heat,shock,and other magnetic field force...
Any ways can change the structure of electrons can destroy the magnetism of a magnet as I know.