Diamagnetic type material

• E.g cadimum, coper and silver, zinc
• Show weak megnatization when external megnatic field is applied.
• No permanent dipole movements in atom

Origen

• Electrons orbit are randomly oriented in space. When megnatic field is applied , induced megnatic moment in produced in opposite direction all such megnatic moment cancels on another with result in zero megnatism.

                              

 

         Characteristics

• It repels megnatic lines of forces.
• It does not depend on temperature and strength of megnatic field.
• Non megnatic movementis present in material.
• Susceptibility is always negative
• Relative permeability <1

Paramagnetic materials

• It has permanent magnetic dipoles.
• When external field is applied magnetic induction present in specemen increases.

Origin

• Permanent magnetic moment arises due to orbital and spin motion of electorns
• But orbital magnetic moment cancels when external field applied
• Spin megnatic moment tends to align direction of external field which results in large magnetization

Characteristics

• Susceptibility is positive and small.
• Relative permeability is >1
• Susceptibility is inversly proportional to absolute temperature of material

Ferro magnetic materials

• Show strong magnetization in direction of applied magnetic field
• Has enormous permanent magnetic moments in each atom.

Origin

• Domains present in material

Characteristics

• Magnetic susceptibility is large and positive.
• Suseptibility depends on temperature
• Magnetic lines of forces are strongly attracted by speciumen.
• Exhibit hystresis phenomena