Here's why:
* Spin Angular Momentum: Electrons possess an intrinsic property called spin angular momentum. This is similar to the Earth spinning on its axis, creating a magnetic field.
* Orbital Angular Momentum: Electrons also orbit the nucleus, creating another form of angular momentum called orbital angular momentum. This motion also contributes to the magnetic field.
The combination of these two forms of angular momentum creates a magnetic dipole moment for each electron. While the individual magnetic fields of electrons are small, when many electrons are aligned, their magnetic fields can add up to create a measurable magnetic field, such as in ferromagnetic materials like iron.
