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www.physlink.com/education/askexperts/ae472.cfm

1) Via heat: ferromagnet materials will lose their magnetism if heated above a ... the magnet from the heat will permanently disrupt the magnetic domain structure of ... is transmitted through the material via a shock, such as being dropped or hit  ...

www.x-magnet.net/faq.html

Heating a magnet past its Curie point will destroy the long range ordering. ... reduce the strength of the (electro-)magnetic field, the magnetism of the magnet can ... becomes a strong magnet in the present of the current but weaken drastically ...

www.quora.com/Why-when-we-heat-a-magnet-does-it-lose-its-strength

Basically because large magnets don't "like" being magnetized and are looking for an ... Heat at a certain temperature breaks/melts/weakens the bonds and the ... It is remarkable what magnetic materials can do depending on temperature.

www.instructables.com/answers/Is-it-possible-to-make-the-magnets-lose-it-magneti

Mar 12, 2009 ... I know magnets can lose its magnetic properties if exposed to heat, but is ... it loose its magnetic field. repetitive shock (as in hitting it with a hammer) .... It might still retain a weak magnetism, but it will be much less than the original strength. ... and the relative motion of other magnetic fields can weaken them.

van.physics.illinois.edu/qa/listing.php?id=2744

At some point, in between the weakening of the overall magnetism and the ... Cooling the material will cause magnetic domains to form again at the Curie ... It's not hard to make materials (alloys, for example) with Curie ... Usually the strength of a permanent magnet does grow slightly as it is cooled.

ask.metafilter.com/235019/Can-I-weaken-a-neodymium-supermagnet

Hitting them will give you a bunch of magnetic shards. Freezing ... But yes, heating those kinds of magnets up will reduce their magnetism.

education.jlab.org/qa/permmagnet_02.html

Permanent magnets can lose their magnetism if they are dropped or banged on ... The reason that would be hard to bump a piece of iron and make it magnetic is ... Field strength is linear with the current in magnets until the magnet saturates.

www.assignmentexpert.com/blog/what-happens-when-you-hit-a-magnet-with-a-hammer

Black lines (called magnetic force lines) show the direction of the field in space. ... if you hit a magnet several times real hard it can lose almost all its strength.

www.answers.com/Q/Why_does_dropping_or_heating_a_magnet_weaken_it

Dropping, hitting, or ... Dropping or heating a magnet will not weaken it because the domains will stay in ... Does hitting a magnet weaken its magnetic force?

www.answers.com/Q/Why_does_a_permanent_magnet_weaken_when_you_drop_or_heat_it

Dropping, hitting, or heating a magnet will disturb the magnetic field-the spin of the electrons goes out of .... Does hitting a magnet weaken its magnetic force?