What is a property of ferromagnetic materials?

Ferromagnetic materials are characterized by their ability to retain significant magnetization even after the external magnetic field is removed. This property is due to the presence of unpaired electron spins that align parallel to each other within the material, leading to spontaneous magnetization. The ability to be durably magnetized by external magnetic fields distinguishes ferromagnetic materials from others, such as paramagnetic materials, which only exhibit magnetization in the presence of an external field and lose it once removed.

The formation of domains, where groups of atoms have their magnetic moments aligned in the same direction, further contributes to the enduring nature of ferromagnetism, allowing these materials to maintain their magnetic properties over time. This makes them essential components in various applications, such as in magnets and magnetic storage devices.