Magnetizability, Magnetization, and Magnetic Susceptibility

When the material is subjected to a magnetic field, H, the magnetization is then proportional to the applied magnetic field according to the following equation  

Sometimes, another physical quantity called the intensity of magnetization, denoted J or Ij, and expressed in tesla (T), was used in old textbooks and it was defined as follows  

In practice, it is also possible to utilize the specific magnetization, denoted and expressed in Am kgas the density of magnetic moment per unit mass of material  

Therefore the relationship between magnetization and specific magnetization involves the mass density p of the material in kg.m  

Therefore the relation existing between the specific magnetization and the magnetic field can now be written as follows  

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