What objects can a magnet attract?

A magnet is a thing that can absorb ferrous substances, such as iron nails, iron keys, iron filings, etc. So besides these objects that are obviously composed of iron components, are there other objects that can be attracted by iron?

A magnet is a thing that can absorb ferrous substances, such as iron nails, iron keys, iron filings, etc. So besides these objects that are obviously composed of iron components, are there other objects that can be attracted by iron?  

First, we must analyze the composition of the magnet. The composition of the magnet is iron, cobalt, nickel and other atoms. The internal structure of the atom is relatively special, and it has a magnetic moment itself.

So a magnet can generate a magnetic field, but there are only a few metals that can be attracted by a magnet, such as iron, nickel, cobalt and other magnetophilic metals.
Most other metals are not attracted, such as: gold, silver, copper, aluminum, tin, lead, titanium, etc.
Of course, in addition to attracting metals, some objects have diamagnetism and paramagnetism.

Diamagnetism: Diamagnetism is a magnetic phenomenon in which certain types of substances produce weak repulsion to a magnetic field when placed in an external magnetic field.
Paramagnetism: Paramagnetism refers to the magnetic state of a material. Some materials can be affected by an external magnetic field, resulting in a property of magnetization vectors pointing in the same direction. Such substances have a positive magnetic susceptibility. The opposite phenomenon of paramagnetism is called diamagnetism.
Ferromagnetism: Ferromagnetism refers to the magnetic state of a material with spontaneous magnetization.
In addition to being used to attract iron to achieve the effect of iron removal, magnets are also used in many fields, such as: compass, attracting light and small objects, electromagnets can be used as electromagnetic relays, motors, generators, electroacoustics, magnetic therapy, Magnetic levitation, NMR, etc.