Ferrous Metals –
All ferrous metals are having iron as common element. All ferrous materials are having very high permeability which makes these materials suitable for construction of core of electrical machines. Examples: Cast Iron, Wrought Iron, Steel, Silicon Steel, High Speed Steel, Spring Steel etc.

Non-Ferrous Metals -
All non-ferrous metals are having very low permeability. Example: Silver, Copper, Gold, Aluminum etc.

Engineering materials can also be classified as below-
Metals and Alloys

Ceramic Materials

Organic Materials

Ceramic materials 

are non-metallic solids. These are made of inorganic compounds such as Oxides, Nitrides, Silicides and Carbides. Ceramic materials possess exceptional Structural, Electrical, Magnetic, Chemical and Thermal properties. These ceramic materials are now extensively used in different engineering fields.
Examples: Silica, glass, cement, concrete, garnet, Mgo, Cds, Zno, SiC etc.

Organic Materials

All organic material are having carbon as a common element. In organic materials carbon is chemically combined with oxygen, hydrogen and other non-metallic substances. Generally organic materials are having complex chemical bonding. 
Example: Plastics, PVC, Synthetic Rubbers etc.

Electrical Engineering materials can be classified as below-Conductors

Semiconductors

Insulators

Magnetic material

Magnetic Materials

These materials play an important role for existence of various electrical machines. The magnetic materials having high permeability are used for building the core to from the low reluctance path for magnetic flux.
Magnetic materials can be further divided in following categories
-Ferromagnetic materials
-Paramagnetic material
-Diamagnetic materials
-Antiferromagnetic materials
-Ferrites

Ferromagnetic Materials

These materials are having very large and positive susceptibility to external magnetic field. They are having a strong attraction to external magnetic field and are able to retain magnetism even after remove of external magnetic field. This property of materials is called magnetic hysteresis.
Example: Iron, Cobalt, Nickel.

Paramagnetic Material

These materials are having very small and positive susceptibility to external magnetic field. In the presence of external magnetic field, these materials attains very small magnetism. Example: Aluminum, Platinum, oxygen, Air etc.

Diamagnetic materials

These materials are having very weak and negative magnetic susceptibility to external magnetic field. On application of external magnetic field these are repelled slightly by external magnetic field. These materials does not retains the magnetism after removal of external magnetic field. Mostly all metals i.e. silver, copper, gold, hydrogen etc. are diamagnetic materials.

Antiferromagnetic materials

These materials are having very small and positive susceptibility to external magnetic field. In the presence of external magnetic field these materials get slightly magnetized in the direction of external magnetic field. In these materials, atoms are having mixed parallel and anti parallel aligned magnetic dipole movement. 
Example: Cr, MNO, FeO, CoO, NiO, Mn etc.

Ferrites

These materials are having very large and positive magnetic susceptibility like ferromagnetic materials. These materials are generally compound which are having more complex crystal structures than a pure material. As compare to ferromagnetic materials, ferrites are having lower magnetic saturation. 
Example: Fe3O4, BaO.6Fe2O3 etc.

State change temperature are of following types-

Melting point- It is the temperature (in oC or K) at which the substance changes from solid state to liquid state.

Boiling point- It is the temperature (in oC or K) at which the substance changes from liquid state to gaseous state.

Freezing point- It is the temperature (in oC or K) at which a liquid changes from liquid to solid state. Theoretically it is equal to the melting point. However, practically there may observed some difference.