# Who introduced the difference between magnetic fields in matter? $\mathbf H$ vs $\mathbf B$

In magnetism, there are two different magnetic fields, that I will simply call $$\mathbf B$$ and $$\mathbf H$$. The distinction is not always clear. In experiments $$\mathbf H$$ is the applied field while $$\mathbf B$$ is the total field that includes the magnetization $$\mathbf M$$ of matter. The three fields are unified under the equation $$\mathbf H=\frac{1}{\mu_0}\mathbf B-\mathbf M.$$

Who was the first to make this distinction?

• Can you access "B and H, the intensity vectors of magnetism: A new approach to resolving a century-old controversy" in American Journal of Physics? doi.org/10.1119/1.19459 Oct 12 at 1:48
• If I recall correctly, this B and H symbolism is due to Maxwell. Oct 12 at 1:49
• @M.Farooq Maxwell introduced the notation but not the concept. But thanks for the reference! Oct 12 at 7:53