In ferromagnetic materials immersed in a magnetic field, magnetization increases as the temperature drops.
In ferromagnetic materials, the atoms' magnetic moments (that is, their spins) are all aligned in the same direction.
Lead, not being a ferromagnetic material, cannot shield or shunt magnetic fields in this way.
As these ferromagnetic substances (the guitar strings) move within the magnetic field of the permanent magnet, it causes the flux through the bobbin to change.
The temperature at which the magnetic ordering in ferromagnetic substances vanishes is known as the Néel temperature.
Pauli's basic model was wrong, as it considered only orbital magnetism; spin, still undiscovered in 1920, has a major role both in ferromagnetism and in the anomalous Zeeman effect.
Permanent magnetism, or ferromagnetism , is a rare property of molecular structures.
Strictly speaking, there are no examples of materials in which singlet superconductivity and ferromagnetism co-exist.
However, they have revealed problems with existing theories of ferromagnetism and superconductivity that are likely to keep researchers busy for some time to come.
It loses its ferromagnetism when what is called the Curie point is reached.