Physics for Information Science: Unit III: Magnetic Properties of Materials
Ferromagnetic Materials
Properties, Effect of external field, Examples
In a ferromagnetic material the number of unpaired electrons are more. Most of these spin magnetic moments point in one direction.
FERROMAGNETIC
MATERIALS
In
a ferromagnetic material the number of unpaired electrons are more. Most of
these spin magnetic moments point in one direction as shown in Fig. 3.9.
Hence
even in the absence of external field, the magnetic moments align themselves
parallel to each other and give rise to magnetic field.
Effect of magnetic field
To
these materials even if a small external magnetic field is applied, the
magnetic moments which are already aligned parallel, reorient itself along the
direction of the magnetic field and they become very strong magnets.
Properties
1.
Since some magnetisation is already existing in these materials, all the
magnetic lines of force passes through it (Fig. 3.10).
2.
They have permanent dipole moment. So they act as strong magnets.
3.
They exhibit magnetisation even in the absence of external field. This property
is called Spontaneous magnetisation.
4.
It's susceptibility is positive and high and it is given by
X
= C/T-Ɵ
5.
When the temperature is greater than curie temperature, ferromagnetic material
becomes paramagnetic material.
6.
Permeability is very much greater than 1.
Examples:
Ni, Co, Fe etc.,
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Properties, Effect of external field, Examples - Ferromagnetic Materials
Physics for Information Science: Unit III: Magnetic Properties of Materials
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Physics for Information Science
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