3. PROPERTIES OF
PARAMAGNETIC MATERIALS
PARAMAGNTISM
3
•The unpaired electrons in the atoms of paramagnetic materials are engaged
in an incessant dipole moment due to the unpaired electron spin.
•Paramagnetic materials move from a weaker region to a stronger region in
a nonuniform electric field.
•The degree of magnetization of paramagnetic materials in an external
electric field (i.e. magnetic susceptibility) is positive and small.
•The magnetic permeability of a paramagnetic substance is greater than or
equal to one.
•Paramagnetic materials are attracted towards the electric field weakly.
•Temperature is inversely proportional to magnetization in a paramagnetic
material.
4. CURIE'S LAW
According to Curie’s law, paramagnetic materials are magnetically
susceptible (can be magnetized), and they show paramagnetism at
a wide range of temperatures.
Curie's law states that the magnetic susceptibility of paramagnetic
materials is inversely proportional to the temperature.
4
PARAMAGNETISM
M = C(B/T)
Where,
•M is the magnetization of the material.
•C is called the material-specific curie's constant.
•T is the temperature in Kelvin.
•B is the applied magnetic field.
5. 5
PRESENTATION
TITLE
At a certain temperature, the magnetic
substances undergo acute changes in
their behaviour and properties, this
temperature is called Curie's
temperature.
•Curie's temperature is also called Curie's
point.
•Curie discovered the relationship of
temperature with magnetic properties.
•Curie's point is different for different
materials.
•A ferromagnetic material becomes
paramagnetic above Curie's temperature,
but paramagnetic materials suffer no
change.
CURIE'S
TEMPERATURE
PARAMAGNTISM
