Physics for Information Science: Unit III: Magnetic Properties of Materials
Hysteresis - M Versus H Behaviour
Magnetic Properties of Materials
When a ferromagnetic material is made to undergo through a cycle of magnetisation, the variation of M (Magnetisation) with respect to H (Applied field) can be represented by a closed hysteresis loop (or) curve.
HYSTERESIS
- M VERSUS H BEHAVIOUR
When
a ferromagnetic material is made to undergo through a cycle of magnetisation,
the variation of M (Magnetisation) with respect to H (Applied field) can be
represented by a closed hysteresis loop (or) curve. i.e., it refers to the
lagging of magnetisation behind the magnetising field.
If
a magnetising field H is applied to a ferromagnetic material and if H is
increased to 'Hmax’ the material acquires the magnetism. So the
magnetisation (M) also increases, represented by 'oa' in the Fig. 3.23.
Now
if the magnetic field is decreased from Hmax to zero, the magnetisation will
not fall rapidly to zero, but falls to 'b' rather than zero. This shows that
even when the applied field is zero (or) removed, the material still acquires
some magnetisation (ob) which is so socalled residual magnetism (or)
Retentivity.
Now,
to remove this residual magnetism, the magnetic field strength is reversed and
increased to - 'Hmax' represented as 'oc' so called coercivity and
hence we get the curve 'bcd'. Then the reverse field (-H) is reduced to zero
and the corresponding curve 'de' is obtained and by further increasing H to
Hmax the curve 'efa' is obtained.
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Magnetic Properties of Materials - Hysteresis - M Versus H Behaviour
Physics for Information Science: Unit III: Magnetic Properties of Materials
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Physics for Information Science
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