Preferred Label : magnetic transition;
IUPAC definition : A transition between disordered and ordered arrays of atomic magnetic moments. Where
the ordered phase has a net spontaneous magnetization, MS, the magnetic-ordering temperature
is called a curie temperature, TC; where the net spontaneous magnetization of the
ordered phase remains zero, the ordering temperature is called a Néel temperature,
TN. The temperature at which the two ferromagnetic subarrays of a ferrimagnet just
cancel each other is called the compensation point. Materials exhibit ferromagnetic
behaviour when unpaired electron spins are aligned in parallel, antiferromagnetic
behaviour when the alignment is antiparallel, and ferrimagnetic behaviour if the alignment
of the spins is antiparallel with unequal numbers in the two orientations or if the
spins are canted. Therefore, ferromagnetic, ferrimagnetic and weak ferromagnetic transitions
involve a net magnetic moment change, whereas antiferromagnetic transitions have zero
net magnetic moment change.;
Scope note : antiferromagnetic order below t nmay be complex; for example, canting of spins as
in gd fe o 3 , spiral-spin configuration as
may occur in mn o 2 , and amplitude modulation, as in some
rare-earth metals.;
Origin ID : M03690;
See also
A transition between disordered and ordered arrays of atomic magnetic moments. Where
the ordered phase has a net spontaneous magnetization, MS, the magnetic-ordering temperature
is called a curie temperature, TC; where the net spontaneous magnetization of the
ordered phase remains zero, the ordering temperature is called a Néel temperature,
TN. The temperature at which the two ferromagnetic subarrays of a ferrimagnet just
cancel each other is called the compensation point. Materials exhibit ferromagnetic
behaviour when unpaired electron spins are aligned in parallel, antiferromagnetic
behaviour when the alignment is antiparallel, and ferrimagnetic behaviour if the alignment
of the spins is antiparallel with unequal numbers in the two orientations or if the
spins are canted. Therefore, ferromagnetic, ferrimagnetic and weak ferromagnetic transitions
involve a net magnetic moment change, whereas antiferromagnetic transitions have zero
net magnetic moment change.
