👉 In physics, ferromagnetism refers to a phenomenon where an object or system with a magnetic field can be magnetized by an external electric field. This means that when an external electric field is applied to this object, it will start to produce a corresponding magnetic field around the object itself. The direction of this magnetic field is opposite to that of the electric field. Ferromagnetism is one of the most fundamental phenomena in physics and has been observed experimentally in many materials such as iron