Paramagnetism

Paramagnetism is a kind of magnetism where several objects are attracted through an externally applied magnetic field. Whereas the diamagnetic materials are repelled by magnetic fields and develop induced magnetic fields in the direction which is opposite to that of the applied magnetic fields.

These materials include most of the chemical elements and some compounds as they have a magnetic permeability greater than or equal to 1. The magnetic moment induced by the applied field is linear to the strength and weakness of the field. It usually needs a sensitive analytical balance to detect the effect and different modern measurements on paramagnetic materials that are often conducted with a SQUID magnetometer.

The paramagnetic material becomes good magnetic material when placed in the strong magnetic material. It acts as a magnet which attracts and repels other magnetic and ferromagnetic materials. When the magnetic field is removed, the total magnetic alignment of the magnetic dipoles is lost and the dipole returned to their normal random motion. This condition is known as Paramagnetism.

The Super Paramagnetism is described as the property as some materials magnetic moments change their direction at the nanoscale and behaves like a paramagnet event. According to Curie law, If there is no magnetic field applied, curie temperature is applied at the same time as they show high magnetic susceptibility.

Curie’s Law

According to this law, the magnetization in the paramagnetic material is inversely proportional to the temperature which means the more the temperature of the paramagnetic material increases, its magnetization decreases.

M = C/(BT)

Where,

C = Curie constant,

T = temperature in Kelvin and,

B = applied the magnetic field.


Practise This Question

Which of the following statements are correct?