Physics for Information Science: Unit III: Magnetic Properties of Materials
Paramagnetic Materials
Properties, Effect of external field, Examples
In the case of paramagnetic materials, the spins in two opposite directions will not be equal.
PARAMAGNETIC
MATERIALS
In
the case of paramagnetic materials, the spins in two opposite directions will
not be equal. There exists some unpaired electrons (Fig. 3.7) which gives rise
to spin magnetic moment. Hence the resultant magnetic moment will not be equal to
zero.
However
in the absence of external field the magnetic moments are oriented randomly.
Due to its random orientation some magnetic moments get cancelled and the
material possess very less magnetisation in it.
Effect of external field
When
an external field is applied, the magnetic moments of individual molecules
reorient itself along the direction of the magnetic field and the material is
magnetised.
Properties
1.
The magnetic lines of force pass through the material (Fig. 3.8)
2.
Magnetic susceptibility is positive and it is given by
X
= C/T-Ɵ (also called Curie-Weiss law)
where
C - Curie constant
T
- Absolute temperature
Ꮎ - Curie
temperature
3.
Permeability is greater than one.
4.
They possess permanent dipole moment.
5.
When the temperature is less than curie temperature, paramagnetic materials
becomes diamagnetic material.
Examples:
CuSO4, MnSO4, Platinum etc.
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Properties, Effect of external field, Examples - Paramagnetic Materials
Physics for Information Science: Unit III: Magnetic Properties of Materials
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Physics for Information Science
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