Physics for Information Science: Unit III: Magnetic Properties of Materials
Anti-Ferromagnetism
Properties, Antiferro-magnetic materials
Antiferromagnetism is a new type of magnetism in which the spins are aligned in antiparallel manner due to unfavourable exchange interaction among them, resulting in zero magnetic moment.
ANTI-FERROMAGNETISM
Antiferromagnetism
is a new type of magnetism in which the spins are aligned in antiparallel
manner (Fig. 3.28) due to unfavourable exchange interaction among them,
resulting in zero magnetic moment. Even when the field is increased, it has
almost zero induced magnetic moment.
Properties
1.
The susceptibility is very small and is positive. It is given by
X
= C / T+Ɵ for T > TN where TN is the Neel temperature.
2.
Initially, the susceptibility increases slightly as the temperature increases
and beyond a particular temperature, known as Neel temperature, the
susceptibility decreases with temperature.
Antiferro-magnetic materials
(i)
Ferrous oxide (FeO)
(ii)
Manganese Oxide (MnO4)
(iii)
Manganese Sulphide (MnS)
(iv)
Chromium Oxide (Cr2O3)
(v)
Ferrous Chloride (FeCl2) and salts of transition elements.
These
elements will be wide range of applications in magnetic storage devices.
Physics for Information Science: Unit III: Magnetic Properties of Materials : Tag: : Properties, Antiferro-magnetic materials - Anti-Ferromagnetism
Physics for Information Science: Unit III: Magnetic Properties of Materials
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