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Antiferromagnetism (Temperature dependence (Magnetic phase change occur…
Antiferromagnetism
Temperature dependence
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Typically, Neel temperature is found below room temperature. Above Neel temperature, it will behave paramagnetically
Below Neel temperature, the magnetic moments is antiparallel and net magnetization is zero
Susceptibility increases inversely with temperature above T and decreases inversely below this temperature
Can be determine by Curie Law
The more general Curie-Weiss Law
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Introduction
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Antiferromagnetic are like ferromagnets but their magnetic moments align antiparallel to the neighboring moments
Allignment occurs spontaneously below critical temperature, Neel temperature
Above Neel temperature, the material becomes paramagnetic
Less common compare to other types of magnetic behaviour, mostly observed at low temperature
Common materials
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Transition metals is sublattice which has magnetic moments that respond to a magnetic field below Neel temperature
Oxide sublattice moments respond to the magnetization of the first lattice by aligning in the opposite direction and same direction
Oxygen alignment influence the other manganese ions ans tell the metal ions how to order their magnetic spin
Applications
Do not have many applications compare to other magnetic materials due to lack of spontaneous magnetization
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