Magnets
made from a mixture of metals including neodymium (rare
earth magnets) are the most powerful permanent magnets ever made.
They have revolutionised the design of things such as loudspeakers and
electric motors and are even used in
jewellery to replace traditional clips
and pins.
They are so powerful that diamagnetic materials (those repelled by both
poles of a magnet) can be pushed away. Water is weakly diamagnetic, and
so a grape (almost 100% water) floating on water will be repelled. A special
form of graphite - pyrolitic
graphite - is strongly diamagnetic and will actually levitate over
four or more magnets placed side by side. This demonstration has never
been possible before.
Just like ferrite magnets neodymium magnets come in the same wide array
of shapes and sizes, but because of their greatly increased strength it
is possible to use a measurably smaller neodymium magnet and still have
an equal or greater strength than that of a ferrite magnet. This is one
of the main reasons why neodymium magnets are much more widely used for
healing purposes than ferrite, as a much smaller and lighter weighing
magnet can be used.
Some common uses for neodymium magnets are:
Welding
clamps
Oil
filters
Toys
Knife/utensil
holders
Jewellery
clasps
Perpetual
motion devices
MRI
Scanners
The
positive benefits of neodymium magnets are:
They
are the strongest magnets available approx 10 times stronger than
ferrite magnets.
They
are very lightweight.
They
do not demagnetise very easily and can with stand temperatures up
to 80°C.
They
can be manufactured to a very small size e.g.2mm x 2mm and still have
a strength of several thousand gauss.
The main drawback of neodymium magnets is that they have a low resistance
to corrosion. To prevent corrosion from water, they must be coated with
plating or an epoxy resin. Neodymium magnets are used for all healing
applications. They are the first choice due to their strength and size.
They will also stay magnetised for at least 10 years, so they are a very
economical choice for users. Most magnetic jewellery, straps, wraps and
beading will contain neodymium magnets.
|
: Mindsets online : Neodymium
Smart Materials