Permanent Magnets:

Any ferromagnetic substance or material, whose atoms can be aligned permanently, can be made into a permanent magnet. Such are the magnets you played with as a child (and might be still play with whenever you use them to stick notes to your refrigerator door). Several alloys can be made into stronger permanent magnets than the others.

One alloy which is especially suitable to making strong permanent magnets is termed by the trade name Alnico. This term derives from the chemical symbols of the metals which include: aluminum (Al), nickel (Ni), and cobalt (Co). The other elements are many times added, involving copper and titanium. Though, any piece of steel or iron can be magnetized to some extent. Many technicians use screwdrivers which are slightly magnetized therefore they can hold onto screws whenever installing or eliminating them from hard-to-reach places.

Permanent magnets are greatest made from materials with high retentivity. They are prepared by using the material as the core of an electromagnet for an unlimited period of time. When you want to magnetize a screwdriver a little bit therefore it will keep onto screws, stroke the shaft of the screwdriver with the end of a bar magnet numerous dozen times. Though, take note: Once you have magnetized a tool, it is practically impossible to wholly demagnetize it.