History of magnets
Magnetic strength, types and measurement
Not all magnets are created equal. Magnets come in many shapes and forms.
Magnets are used for hundreds of applications from large industry purposes like
the automotive industry to domestic applications such as audio speakers; you
will even find them in your television. With so many different types, shapes,
and strengths of magnets it can be easy to mistake an industrial magnet for a
healing magnet. In this chapter we will discuss the difference between the
various materials magnets can be made of and their applications.
Hard ferrite (ceramic) magnets were developed in the 1960's as a low cost
alternative to metallic magnets. They are made from strontium carbonate and iron
oxide both of which are readily available and low in cost. Even though they
exhibit low magnetic fields (compared with other permanent magnet
materials) ,ferrite magnets are widely used for industrial and domestic purposes.
Ferrite magnets have good resistance to demagnetization, excellent corrosion
resistance and the biggest advantage of such economic cost.
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