Iron, Cobalt and Nickel.
Permanet Magnet
A refrigerator is not a magnet, however it does contain an electric motor, and within that motor are permanent magnets (as well as electromagnets).
no they can not.
It depends on the material the key is made of. If the key is made of a ferromagnetic material, such as iron, then yes, a magnet will attract it. If the key is made of a non-magnetic material, such as aluminum or brass, then the magnet will not attract it.
magnet where not made they were discovered,900 years ago lodstone was discovered it contain special properties to attract other material such as magnetic material
A superconducting magnet is one that is made of material that exhibits the property of superconductivity.
They are generally made of a ferrous material and require no external stimulation to produce the magnetic field they have a north and south pole.
That might depend on what material the magnet is made from, but usually magnets are made from metals or alloys, i.e., electrical conductors.
A refrigerator magnet is typically made of a material known as ferrite, which is a type of ceramic often used for its magnetic properties. The ferrite material is combined with other materials such as plastic or rubber to create the final refrigerator magnet product.
ductile
The material from which the magnet is to be made is heated so that it is above what is called the curie temperature. The material is then allowed to cool in a magnetic field. The magnetic field can be made by coiling wire and passing an electric current through it.
The process of making a material into a magnet is called magnetization. This involves aligning the magnetic domains within the material, which creates a net magnetic field. This can be achieved through methods such as rubbing a material with a magnet or applying an external magnetic field.